OBJECTID|DescriptionOfMapUnits_ID|Category|Type|Symbol|Label|MapUnit|Name|FullName|Age|AgeType|AgeOldest|AgeYoungest|Description|HierarchyKey|ParagraphStyle|AreaFillRGB|AreaFillPatternDescription|GeoMaterialDictID|GeoMaterial|GeoMaterialConfidence|Notes|DataSourceMethod|DescriptionSourceID|created_user|created_date|last_edited_user|last_edited_date|GlobalID
|1|{045D1D80-5041-4BC0-A6A7-3FBBA8C50755}|map unit|map unit, generic|2A00|*Ma|IPMa|Amsden Formation|Amsden Formation|Pennsylvanian and Mississippian|unprovided|Pennsylvanian|Mississippian|Reddish brown, fine-grained sandstone, calcareous siltstone, shale, and limestone. A thin interval of pebble conglomerate marks its top. The Amsden Formation is poorly exposed and therefore distinguished by reddish soil or a recessive interval between the underlying Madison Group and the overlying Quadrant Formation. Estimated thickness is 90 m (295 ft).|06-05|dmu, map unit|204,235,255||{33F67A5B-8B6D-493B-BD7F-A3241BF3BB13}|Sandstone and mudstone|high||1|DAS01|||SVUKE|2022-06-02 17:13:24|{045D1D80-5041-4BC0-A6A7-3FBBA8C50755}
2|{7AA105FF-BF56-423D-9AF8-CF2D80F40F8A}|map unit|map unit, generic|32A0|*q|IPq|Quadrant Formation|Quadrant Formation|Pennsylvanian|unprovided|Pennsylvanian|Pennsylvanian|White to tan, fine- to medium-grained, vitreous quartzite that is poorly bedded to massive. Weathers to a greenish gray or rusty brown surface spotted by black lichens. The quartzite is locally brecciated, perhaps by tectonism. The Quadrant Formation is an excellent ridge-forming marker horizon easily distinguishable from most other stratigraphic units. Estimated thickness is 60 m (197 ft).|06-04|dmu, map unit|179,204,235||{58AA9A01-133F-46B5-A023-A044212E1BD3}|Sandstone|medium||1|DAS01|||SVUKE|2022-06-02 17:27:13|{7AA105FF-BF56-423D-9AF8-CF2D80F40F8A}
3|{133EB736-5E9F-49AF-B352-FF166E879D33}|map unit|map unit, generic|3220|Jme|Jme|Morrison Formation and Ellis Group, undivided|Morrison Formation and Ellis Group, undivided|Late to Middle Jurassic|unprovided|Middle Jurassic|Late Jurassic|Morrison Formation (Late Jurassic)—Poorly exposed olive green and gray- to grayish-green mudstone, shale, siltstone, and minor sandstone. Siltstone near base is calcareous and flaggy. Dense, salt-and-pepper sandstone and minor concretionary limestone occur in the upper part. Thickness is approximately 47–67 m (154–220 ft). Ellis Group (Late to Middle Jurassic)-Swift Formation: upper part is brown to yellowish brown, often calcareous and glauconitic, salt-and-pepper sandstone with interbedded siltstone and micaceous shale. Basal sandstone contains lenses of black chert-pebble conglomerate. Sparce fossils include oysters, belemnites, and wood fragments. Thickness is approximately 35–75 m (115–246 ft). Rierdon Formation: dark brownish gray to dark gray calcareous shale, shaly limestone, and limestone. Shales weather yellowish gray or whitish gray. Fossil fragments and ripple marks are common on bedding planes. Brown, oolitic or sandy limestone beds mark the stratigraphic base. Thickness is approximately18–23 m (59–75 ft). Sawtooth Formation: the upper part is interbedded calcareous shale, siltstone, and limestone; the middle part is very calcareous dark gray shale or argillaceous limestone that weathers creamy white; the lower part is dark gray to black, fossiliferous, calcareous buff-weathering siltstone. Approximate thickness is 75 m (246 ft).|06-02|dmu, map unit|179,204,204||{BA4AC2E3-4497-4C92-B603-75B4A05BC069}|Mostly mudstone|medium||1|DAS01|||SVUKE|2022-06-02 17:23:23|{133EB736-5E9F-49AF-B352-FF166E879D33}
4|{4FDE874C-2408-44EC-A974-5E2567245926}|map unit|map unit, generic|6460|Kk|Kk|Kootenai Formation|Kootenai Formation|Early Cretaceous|unprovided|Early Cretaceous|Early Cretaceous|Deposits of mudstone, siltstone, limestone, salt-and-pepper sandstone, and conglomerate in four informal members from top to bottom: upper calcareous; upper clastic; lower calcareous; and lower clastic. The upper calcareous member is gray, fine- to medium-crystalline limestone with minor interbedded shale, siltstone, and sandstone. The top is marked by a dark gray coarsely crystalline limestone composed almost entirely of gastropod shells. The upper clastic member consists of green, gray, and maroon siltstone and shale with a few thin calcareous salt-and-pepper sandstone and limestone beds, including a distinctive flat-pebble limestone conglomerate. The lower calcareous member consists of interbedded, dark gray to black, very fine-grained limestone; maroon, green, and gray shale and siltstone; and occasional beds of calcareous concretions. The lower clastic member is maroon and gray sandstone interbedded with minor shale and siltstone. Either hard silica-cemented vitreous sandstone with distinct red jasper grains or lenticular beds of red-brown weathering conglomerate with pebbles and cobbles of black chert and white quartzite mark the base of the Kootenai Formation. Good exposures occur in roadcuts along Gimlet Creek (fig.1). Total thickness is approximately 330 m (1,085 ft).|06-01|dmu, map unit|102,153,102||{BA4AC2E3-4497-4C92-B603-75B4A05BC069}|Mostly mudstone|low||1|DAS01|||SVUKE|2022-06-02 17:25:04|{4FDE874C-2408-44EC-A974-5E2567245926}
5|{ABC5F00D-9439-46A1-9CD0-F6268392EE13}|map unit|map unit, generic|4430|MDtm|MDtm|Three Forks, Jefferson, and Maywood Formations, undivided|Three Forks, Jefferson, and Maywood Formations, undivided|Early Mississippian and Late Devonian|unprovided|Late Devonian|Early Mississippian|Thick sequence of shale, siltstone, limestone, and dolomite. Limestone and dolomite of the Jefferson Formation commonly form ridges, cliffs, and spires. The Three Forks and Maywood Formations are poorly exposed. There is only a small occurrence of this unit near the western boundary of the map; it is best observed in the Warm Springs drainage in the west-adjacent Windy Rock 7.5' quadrangle. Thickness is approximately 320 m (1,050 ft).|06-07|dmu, map unit|153,153,179||{BA4AC2E3-4497-4C92-B603-75B4A05BC069}|Mostly mudstone|low||1|DAS01|||SVUKE|2022-06-02 17:25:16|{ABC5F00D-9439-46A1-9CD0-F6268392EE13}
6|{C409C4E5-63C0-405E-B93F-306CFE890A66}|map unit|map unit, generic|2210|Mm|Mm|Madison Group, undivided|Madison Group, undivided|Mississippian|unprovided|Mississippian|Mississippian|Thick sequence of limestone, limestone breccia, and chert that generally forms prominent ridges, cliffs, and hoodoos. Mission Canyon Formation—Upper part is light to medium gray limestone breccia with interbedded medium-bedded limestone and dolomitic limestone. Breccias contain angular limestone and siltstone clasts in an orange- or red-stained matrix. Lower part is light to dark gray, partly cherty, medium- to very thick-bedded limestone and minor dolomite. Typically fossiliferous and oolitic. Weathers medium to light gray. Thickness is approximately 250 m (820 ft). Lodgepole Formation—Dark gray, fossiliferous, thin-bedded limestone and silty limestone. Abundant interbeds of dark gray to black chert nodules, ribbons, and beds, especially in lower part. The upper part is more fossiliferous with thick beds and some breccia. Weathers light to medium gray. Thickness is approximately 270 m (885 ft).|06-06|dmu, map unit|204,204,222||{17AAA689-8B7C-40D3-B384-264AAD16094A}|Limestone|high||1|DAS01|||SVUKE|2022-06-02 17:28:24|{C409C4E5-63C0-405E-B93F-306CFE890A66}
7|{FB870C57-9963-4988-AA22-ACFA9AB6D3C6}|map unit|map unit, generic|4320|Pp|Pp|Phosphoria Formation|Phosphoria Formation|Permian|unprovided|Permian|Permian|Bluish gray and brown weathering sandstone, shale, bedded chert, and oolitic phosphatic rock. The Phosphoria Formation is poorly exposed and difficult to distinguish in the field. Relatively good exposures occur near the Luke Mine in the south-adjacent Luke Mountain quadrangle. Estimated thickness is 80 m (260 ft).|06-03|dmu, map unit|153,179,204||{33F67A5B-8B6D-493B-BD7F-A3241BF3BB13}|Sandstone and mudstone|medium||1|DAS01|||SVUKE|2022-06-02 17:29:18|{FB870C57-9963-4988-AA22-ACFA9AB6D3C6}
8|{A2491DA0-EFE0-4DC5-AA2F-B282AF21C1E6}|map unit|map unit, generic|1240|Qac|Qac|alluvium and colluvium|alluvium and colluvium|Quaternary: Holocene|unprovided|Holocene|Holocene|Silt, sand, granules, and pebbles deposited on slopes by sheetwash alluvium incorporated with locally derived fine-grained colluvium.|01-02|dmu, map unit|222,204,153||{CDCCF787-1D4D-4CE1-A829-F0019B58A0C9}|Silt and clay of unspecified origin|medium||1|DAS01|||SVUKE|2022-06-02 17:31:22|{A2491DA0-EFE0-4DC5-AA2F-B282AF21C1E6}
9|{F6B768FD-2483-41D1-9799-798402DCB4BE}|map unit|map unit, generic|A140|Qaf|Qaf|alluvial-fan deposit|alluvial-fan deposit|Quaternary: Holocene|unprovided|Holocene|Holocene|Gravel, sand, silt, and clay in fan-shaped deposit at the mouth of a tributary of Sixmile Creek. Clasts are iron-oxide stained, and reworked from an associated glacial outwash deposit.|01-03|dmu, map unit|235,222,153||{728F76CD-FCFA-4F82-AC67-08457BC28C68}|Sand and gravel of unspecified origin|high||1|DAS01|||SVUKE|2022-06-02 17:31:33|{F6B768FD-2483-41D1-9799-798402DCB4BE}
10|{1A94B063-E002-471D-B772-BDE0C33E84FA}|map unit|map unit, generic|AA10|Qal|Qal|alluvium|alluvium|Quaternary: Holocene|unprovided|Holocene|Holocene|Gravel, sand, silt, and clay along streams and their tributaries. Clasts are generally cobbles and smaller, and are rounded to subrounded.|01-01|dmu, map unit|235,235,222||{EFF14953-918D-4560-87E8-CB91351003C9}|Alluvial sediment, mostly coarse-grained|high||1|DAS01|||SVUKE|2022-06-02 17:32:27|{1A94B063-E002-471D-B772-BDE0C33E84FA}
11|{E42FBE31-4614-42A9-8258-344A600FF9C5}|map unit|map unit, generic|1120|Qalo|Qalo|alluvium: older than Qal|alluvium: older than Qal|Quaternary: Pleistocene|unprovided|Pleistocene|Pleistocene|Deposits beneath floodplains, assumed to be similar to Qal, but generally covered with fine-grained floodplain deposits.|01-07|dmu, map unit|222,222,204||{EFF14953-918D-4560-87E8-CB91351003C9}|Alluvial sediment, mostly coarse-grained|high||1|DAS01|||SVUKE|2022-06-02 17:33:10|{E42FBE31-4614-42A9-8258-344A600FF9C5}
12|{2BAB5EAE-7D2C-4196-9FF2-2AAE133C0D8D}|map unit|map unit, generic|2270|Qbgr|Qbgr|boulder gravel|boulder gravel|Quaternary: Pleistocene|unprovided|Pleistocene|Pleistocene|Deposits that were likely reworked from older boulder gravel (Tbgr) or glacial outwash deposits (Qgo). Dominantly clast-supported, subrounded pebbles and cobbles.|01-05|dmu, map unit|204,204,077||{728F76CD-FCFA-4F82-AC67-08457BC28C68}|Sand and gravel of unspecified origin|high||1|DAS01|||SVUKE|2022-06-02 17:34:26|{2BAB5EAE-7D2C-4196-9FF2-2AAE133C0D8D}
13|{9783D348-8C80-44A6-8641-B8C1DCDCB911}|map unit|map unit, generic|12X0|Qgo|Qgo|glacial outwash|glacial outwash|Quaternary: Pleistocene|unprovided|Pleistocene|Pleistocene|Deposits along Sixmile Creek that represent the terminus of a large glacial outwash fan that continues into the east-adjacent Ophir Creek 7.5' quadrangle. Fan is about 6.5 km (4 mi) wide. Dominantly reworked, subrounded, iron-stained pebbles and cobbles, dominantly clast-supported.|01-06|dmu, map unit|222,204,000||{EFF14953-918D-4560-87E8-CB91351003C9}|Alluvial sediment, mostly coarse-grained|high||1|DAS01|||SVUKE|2022-06-02 17:35:05|{9783D348-8C80-44A6-8641-B8C1DCDCB911}
14|{13143A34-D72F-4BDB-BB34-C4C5A91C729F}|map unit|map unit, generic|1250|Qls|Qls|landslide deposit|landslide deposit|Quaternary: Holocene|unprovided|Holocene|Holocene|Mass-wasting deposit of rotated or chaotic beds. The bentonitic Climbing Arrow Member of the Renova Formation and units that immediately overlie it are particularly prone to landslide development.|02-01|dmu, map unit|222,204,128||{743EA93E-C344-4316-A975-A09F39CC0243}|Debris flows, landslides, and other localized mass-movement sediment|high||1|DAS01|||SVUKE|2022-06-02 17:37:33|{13143A34-D72F-4BDB-BB34-C4C5A91C729F}
15|{0E38B338-F284-49FA-BBE2-6CB7CEDD5CAE}|map unit|map unit, generic|A160|Qlso|Qlso|landslide deposit, older than Qls|landslide deposit, older than Qls|Quaternary: Holocene or Pleistocene|unprovided|Pleistocene|Holocene|Deposit on the east side of Antelope Hill that slid downslope through mass wasting, resulting in a landslide scarp. The topographic expression of Qlso is more subdued than secondary landslide deposits (Qls) developed within the older deposit. Deposit slid on bentonitic Climbing Arrow Member of the Renova Formation (Trca).|02-02|dmu, map unit|235,222,102||{743EA93E-C344-4316-A975-A09F39CC0243}|Debris flows, landslides, and other localized mass-movement sediment|high||1|DAS01|||SVUKE|2022-06-02 17:39:15|{0E38B338-F284-49FA-BBE2-6CB7CEDD5CAE}
16|{86F6F34E-3B8E-48CE-B3D7-3169B0F51B4C}|map unit|map unit, generic|2250|Qm|Qm|mantle|mantle|Quaternary: Holocene and Pleistocene|unprovided|Pleistocene|Holocene|Deposit that includes sheetwash alluvium, colluvium, coarse-grained (pebble, cobble, small boulder) lag from older debris-flow deposits, and regolith.|01-04|dmu, map unit|204,204,128||{728F76CD-FCFA-4F82-AC67-08457BC28C68}|Sand and gravel of unspecified origin|low||1|DAS01|||SVUKE|2022-06-02 17:39:08.000001|{86F6F34E-3B8E-48CE-B3D7-3169B0F51B4C}
17|{64F7FCA5-EB22-4E8C-A236-F39D82A9122A}|map unit|map unit, generic|1270|QTdf|QTdf|debris-flow deposit|debris-flow deposit|Quaternary or Tertiary|unprovided|Tertiary|Quaternary|Matrix-supported deposits in the southern part of the map that include angular and subangular boulders and smaller clasts derived from the west side of the valley. Mapped primarily on the basis of boulder lag on a topographically irregular surface.|02-03|dmu, map unit|222,204,077||{743EA93E-C344-4316-A975-A09F39CC0243}|Debris flows, landslides, and other localized mass-movement sediment|high||1|DAS01|||SVUKE|2022-06-02 17:39:37|{64F7FCA5-EB22-4E8C-A236-F39D82A9122A}
18|{2971EF3F-08C1-413A-8F12-990CD1006D3E}|map unit|map unit, generic|2370|QTtr|QTtr|travertine|travertine|Quaternary–Tertiary?|unprovided|Tertiary|Quaternary|Coarsely crystalline calcium carbonate that commonly consists of beds 3–50 cm thick that are generally disturbed/chaotic. Carbonate deposition is no longer active and karst topography covered by soil has developed. Generally poorly exposed.|03-01|dmu, map unit|204,179,077||{1D871FE3-5589-442E-B930-589778137872}|Carbonate rock|medium||1|DAS01|||SVUKE|2022-06-02 17:41:41|{2971EF3F-08C1-413A-8F12-990CD1006D3E}
19|{B0F1231F-2366-4C7D-87E2-CE588236B0D9}|map unit|map unit, generic|2420|Tba|Tba|basalt to trachyandesite|basalt to trachyandesite flow|Tertiary: Oligocene|unprovided|Oligocene|Oligocene|Black, fine-grained, massive basalt to trachyandesite lava flows (Tba) and intrusion (Tbai) with phenocrysts of plagioclase, clinopyroxene and orthopyroxene, biotite, olivine, and rare resorbed quartz. Locally vesicular, weathers to light brown, and forms angular to sub-rounded blocks; some flows have columnar joints and distinct autobreccia. The aphanitic groundmass consists mainly of plagioclase microcrystals, but also includes pyroxenes, biotite, and Fe-oxides. This unit yielded an U-Pb zircon age of 29.95 ± 0.17 Ma (table 2). Similar basaltic lavas near Nevada Lake (fig. 1) yielded a K-Ar age of 32.3 ± 0.17 Ma (Reynolds, written commun., 2015).|05-01|dmu, map unit|204,153,204||{0EB35B4C-25D4-4CC4-B3F4-84063C5D7F3B}|Mafic-composition lava flows|high||1|DAS01|||SVUKE|2022-06-02 17:42:27.000001|{B0F1231F-2366-4C7D-87E2-CE588236B0D9}
20|{0D52583B-FEDB-45F9-9E79-3B07C4B64B3E}|map unit|map unit, generic|2420|Tbai|Tbai|basalt to trachyandesite|basalt to trachyandesite intrusion|Tertiary: Oligocene|unprovided|Oligocene|Oligocene|Black, fine-grained, massive basalt to trachyandesite lava flows (Tba) and intrusion (Tbai) with phenocrysts of plagioclase, clinopyroxene and orthopyroxene, biotite, olivine, and rare resorbed quartz. Locally vesicular, weathers to light brown, and forms angular to sub-rounded blocks; some flows have columnar joints and distinct autobreccia. The aphanitic groundmass consists mainly of plagioclase microcrystals, but also includes pyroxenes, biotite, and Fe-oxides. This unit yielded an U-Pb zircon age of 29.95 ± 0.17 Ma (table 2). Similar basaltic lavas near Nevada Lake (fig. 1) yielded a K-Ar age of 32.3 ± 0.17 Ma (Reynolds, written commun., 2015).|05-02|dmu, map unit|204,153,204|327-K|{0EB35B4C-25D4-4CC4-B3F4-84063C5D7F3B}|Mafic-composition lava flows|high||1|DAS01|||SVUKE|2022-06-02 17:42:32|{0D52583B-FEDB-45F9-9E79-3B07C4B64B3E}
21|{93D8759C-5E6A-4A45-A31A-1C5706ABBE3D}|map unit|map unit, generic|1470|Tbgr|Tbgr|boulder gravel|boulder gravel|Tertiary: Miocene?|unprovided|Miocene|Miocene|Dominantly matrix-supported, but locally clast-supported deposits. Clasts range from pebbles to large boulders in a clay/silt/sand matrix. Clast composition dominantly Mesoproterozoic Belt Supergroup quartzite with subordinate volcanic and plutonic rock. Loen (1990) and Schmidt and others (1994) interpreted the deposit in the east-adjacent Ophir Creek 7.5' quadrangle to be Miocene age and to contain placer gold. Estimated thickness as much as 300 m (985 ft).|04-01|dmu, map unit|222,153,077||{728F76CD-FCFA-4F82-AC67-08457BC28C68}|Sand and gravel of unspecified origin|high||1|DAS01|||SVUKE|2022-06-02 16:45:43|{93D8759C-5E6A-4A45-A31A-1C5706ABBE3D}
22|{C28F7D97-9C09-4F97-88EE-845B5FC356BA}|map unit|map unit, generic|1310|Tda|Tda|trachyandesite|trachyandesite|Tertiary: Eocene|unprovided|Eocene|Eocene|Dark gray and dark greenish gray, aphanitic to weakly porphyritic trachyandesite. Lava flows commonly exhibit a conspicuous flow foliation and form flaggy, angular talus, often with red iron oxide stain on parting surfaces. Aphanitic lavas exhibit a strong trachytic texture consisting mainly of plagioclase microcrystals, but also include minor amounts of pyroxene, magnetite, and volcanic glass. Porphyritic flows contain <10–15 percent phenocrysts of plagioclase, amphibole, and occasional biotite. Thickness is 0–480 m (0–1,575 ft).|05-04|dmu, map unit|222,179,222||{9794E6AC-988C-43F5-B3E7-AF45990C41ED}|Intermediate-composition lava flows|high||1|DAS01|||SVUKE|2022-06-02 16:46:33|{C28F7D97-9C09-4F97-88EE-845B5FC356BA}
23|{3EC6EAA5-7DAD-4B26-A324-7B4AE17AE33D}|map unit|map unit, generic|4640|Tdap|Tdap|trachydacite to trachyandesite porphyry|trachydacite to trachyandesite porphyry|Tertiary: Eocene|unprovided|Eocene|Eocene|Gray-, green-, and red- weathering porphyritic trachydacite to trachyandesite lava flows containing subhedral to euhedral phenocrysts of plagioclase (up to ~5 mm) and minor amounts of amphibole, biotite, and quartz. The aphanitic groundmass commonly has a trachytic texture and consists mainly of aligned micro-laths of plagioclase, but also includes amphibole, biotite, and magnetite. Often, up to several meters of autobrecciated rock surrounds coherent interiors of individual lava flows. Commonly weathers to blocks or plates, with some outcrops forming hoodoos or spires. Rock samples collected in the west-adjacent Windy Rock quadrangle yielded U-Pb ages of 47.1 ± 0.29 to 46.74 ± 0.27 Ma (Mosolf, 2016). Thickness is 0–600 m (0–1,970 ft).|05-05|dmu, map unit|153,102,153||{9794E6AC-988C-43F5-B3E7-AF45990C41ED}|Intermediate-composition lava flows|high||1|DAS01|||SVUKE|2022-06-02 17:43:01|{3EC6EAA5-7DAD-4B26-A324-7B4AE17AE33D}
24|{D44D89FB-7D15-4578-8B48-9EF871518FEE}|map unit|map unit, generic|5730|Tdat|Tdat|dacitic tuff|dacitic tuff|Tertiary: Eocene|unprovided|Eocene|Eocene|Massive or flow-banded variably silicified dacite tuff that contains phenocrysts of plagioclase, quartz, biotite, and amphibole. The groundmass is almost entirely devitrified glass with some magnetite. Scoriaceous pumice lapilli occur locally and account for up to ~50 percent of the rock. Pumice is commonly flattened into fiamme attributed to compaction during diagenesis rather than by welding of a hot ash-flow. Fine-grained intervals contain preserved plant and wood fragments, and are possibly water-lain. Poorly exposed and therefore often distinguished by flaggy chips that are white, yellow, and orange weathering. Relatively good exposures occur in a quarry near Deer Park (fig.1) and in roadcuts 1–2 mi SW of Rhine Hill (fig.1). An U-Pb zircon age of 47.4  ±  0.19 Ma (table 2) was obtained for this unit. Thickness is 0–150 m (0–490 ft).|05-06|dmu, map unit|128,077,179||{12842466-7DCE-4C10-BD53-6B2D6CAC0C2B}|Intermediate-composition air-fall tephra|high||1|DAS01|||SVUKE|2022-06-02 17:42:52|{D44D89FB-7D15-4578-8B48-9EF871518FEE}
25|{9185E94A-A724-49D4-B87E-6713375A7CB5}|map unit|map unit, generic|1660|Tj|Tj|jasperoid breccia|jasperoid breccia|Tertiary?|unprovided|Tertiary|Tertiary|Light gray to red, dense, silicified breccia. Contains angular clasts of limestone in a jasperoid matrix; locally shows liesegang banding. Forms “pipes” at the intersection of NW- and NE-trending faults|03-02|dmu, map unit|222,102,102|605|{8FCFA298-6ACE-4EBB-A6FA-35D9532FD114}|Chert|low||1|DAS01|||SVUKE|2022-06-02 17:42:47|{9185E94A-A724-49D4-B87E-6713375A7CB5}
26|{7AC569A7-C3B5-4A2C-A045-C064F4BD216E}|map unit|map unit, generic|03A0|Tr|Tr|rhyolite|rhyolite|Tertiary: Eocene|unprovided|Eocene|Eocene|Porphyritic rhyolite with distinct red, white, and green laminations 2–20 mm thick. Contains phenocrysts of subhedral plagioclase, amphibole, biotite, and rare quartz within an aphanitic groundmass of devitrified glass and flow-aligned microcrystals of euhedral plagioclase, hornblende, and biotite. Mafic phenocrysts are generally altered to opaque Fe-oxides. The rocks exhibit well-developed flow banding and are brecciated locally. Possibly formed as a lava dome or plug. Occurs near Davis Creek, where it overlies or possibly intrudes Eocene lava flows (Tda). This unit yielded an U-Pb zircon age of 46.01 ± 0.23 Ma (table 2). Thickness is 0–600 m (0–1,970 ft)|05-03|dmu, map unit|255,179,235||{3C375FA3-3611-4866-905B-178BB0A1A14D}|Fine-grained, felsic-composition intrusive igneous rock|medium||1|DAS01|||SVUKE|2022-06-02 17:43:15|{7AC569A7-C3B5-4A2C-A045-C064F4BD216E}
27|{A2916C1F-7542-4807-95BD-4FD0352B3722}|map unit|map unit, generic|23X0|Trca|Trca|Renova Formation: Climbing Arrow Member|Climbing Arrow Member of Renova Formation of Bozeman Group|Tertiary: Eocene|unprovided|Eocene|Eocene|Pale olive, light olive gray, moderate olive brown, and medium light gray bentonitic mudstone and yellowish gray siltstone. Contains lenses of brownish gray sandstone, and gravel/conglomerate in which pebbles dominate in a sand/granule matrix. Sandstone is dominantly medium- to coarse-grained. Gravel or conglomerate consists of clast-supported lenses of rounded granules, pebbles, and cobbles of rhyolite porphyry and other volcanic lithologies in a sandy matrix. Mudstone typically displays “popcorn” weathering, large desiccation cracks, and is prone to landslide development. Exposed thickness is approximately 90 m (295 ft).|04-03|dmu, map unit|204,179,000||{BA4AC2E3-4497-4C92-B603-75B4A05BC069}|Mostly mudstone|low||1|DAS01|||KMCDONALD|2022-07-20 16:33:42|{A2916C1F-7542-4807-95BD-4FD0352B3722}
28|{35370870-31AE-4A43-868C-0533195C5A44}|map unit|map unit, generic|1370|Trcp|Trcp|Renova Formation: Cabbage Patch member|Cabbage Patch member of Renova Formation of Bozeman Group|Tertiary: Miocene and/or Oligocene|unprovided|Oligocene|Miocene|Gastropod-bearing marlstone, thinly bedded limestone, tufa, travertine, and local gastropod coquina that in many places overlie a coarse-grained sandstone with plant impressions, petrified wood, and associated shale. Sandstone contains lenses of pebble conglomerate with rounded to subrounded clasts. Carbonate beds are locally silicified to white-weathering, gray porcellanite and variegated chert. Best exposed on Antelope Hill between Strickland and Halfway Creeks where it overlies the Climbing Arrow Member (Trca). Faint outlines of gastropods are discernible in recrystallized limestone along the crest of Antelope Hill, coinciding with the axial trace of the Antelope Hill syncline. Member overlies volcanic rock at lower elevations in the Garnet Range (fig. 1), commonly occurring as float that may be a lag deposit. Native peoples quarried silicified beds, named the Avon Chert by archeologists, near Antelope and Rhine Hills (fig. 1) . The Avon chert has a distinctive laser ablation inductively coupled plasma mass spectrometry signature that has been used to track archeological artifacts as far east as Illinois (Roll and others, 2005). Near Rhine Hill, the unit is brecciated and contains rounded rip-up clasts. Tuffaceous siltstone and quartzose sandstone exposed on Antelope Hill east of Halfway Creek were included in the map unit. Exposed thickness approximately 90 m (295 ft).|04-02|dmu, map unit|222,179,077||{50C3A3D5-8DE1-4D41-BC42-99D99E44EF39}|Mostly carbonate rock|low||1|DAS01|||KMCDONALD|2022-07-20 16:34:08|{35370870-31AE-4A43-868C-0533195C5A44}
29|{2A2E321E-5523-4F5C-AE71-9C0C4285D564}|header|header, generic||||ALLUVIAL AND COLLUVIAL DEPOSITS|ALLUVIAL AND COLLUVIAL DEPOSITS||unprovided||||01|dmu, header|||||||1|DAS01|||SVUKE|2022-06-02 17:07:49|{2A2E321E-5523-4F5C-AE71-9C0C4285D564}
30|{B938544F-94BC-48D1-9B77-E0B69D8E8730}|header|header, generic||||MASS MOVEMENT DEPOSITS|MASS MOVEMENT DEPOSITS||unprovided||||02|dmu, header|||||||1|DAS01|||SVUKE|2022-06-02 16:45:43|{B938544F-94BC-48D1-9B77-E0B69D8E8730}
31|{6E6879EB-3C1C-4CB5-B683-7841DC47F0A1}|header|header, generic||||HYDROTHERMAL DEPOSITS|HYDROTHERMAL DEPOSITS||unprovided||||03|dmu, header|||||||1|DAS01|||SVUKE|2022-06-02 16:45:43|{6E6879EB-3C1C-4CB5-B683-7841DC47F0A1}
32|{2E2E1EED-B7E3-4635-B123-F7A7D30142DA}|header|header, generic||||TERTIARY SEDIMENTARY DEPOSITS|TERTIARY SEDIMENTARY DEPOSITS|Tertiary|unprovided|Tertiary|Tertiary|The youngest Tertiary sedimentary deposits are Miocene (?) boulder gravels associated with a fault system along the northeast edge of the Avon Valley (McDonald and others, 2016). Poorly lithified and fine-grained sedimentary deposits underlying the Avon Valley are identified as the Cabbage Patch and Climbing Arrow Members of the Renova Formation through lithostratigraphic correlation to units of corresponding age in adjacent valleys (Rasmussen, 1989). These deposits are interpreted to have formed in lacustrine and associated environments, and are generally composed of limestone, marlstone, bentonitic mudstone, carbonaceous shale, and subordinate sandstone, pebble or granule conglomerate, gastropod coquina, volcanic ash, and lignite. Renova Formation exposed at the surface is as much as 180 m (590 ft) thick, and a recently completed gravity survey suggests that as much as 1,500 m (4,920 ft) of poorly consolidated sedimentary deposits underlie the Avon Valley (Knatterud and others, 2015). Bentonitic mudstone in the Renova Formation is prone to landslide development.|04|dmu, header|||||||1|DAS01|||SVUKE|2022-06-02 16:45:43|{2E2E1EED-B7E3-4635-B123-F7A7D30142DA}
33|{E2191577-F3A9-418E-B8C5-C273728DC67B}|header|header, generic||||TERTIARY VOLCANIC ROCKS|TERTIARY VOLCANIC ROCKS|Tertiary|unprovided|Tertiary|Tertiary|Tertiary volcanic rocks were formed from effusive-type eruptions during the Eocene and Oligocene, and likely came from multiple vents. The extrusive Eocene volcanic units include trachyandesite, trachydacite, and rhyolitic lavas and tuffs (fig. 2; table 1). All of these sequences generally have a high-K, calc-alkaline affinity and exhibit a “subduction signature” of enriched, large-ion lithophile elements and depleted high field-strength elements. Eocene volcanism was synchronous with regional crustal transtension and rapid exhumation of the nearby Anaconda Metamorphic Core Complex (~53–40 Ma; Foster and others, 2007). Oligocene basalt to trachyandesite lavas occur along the margin of the Avon Valley and are locally intercalated with Tertiary sediments. These rocks are alkalic and exhibit a shoshonitic affinity.|05|dmu, header|||||||1|DAS01|||SVUKE|2022-06-02 16:45:43|{E2191577-F3A9-418E-B8C5-C273728DC67B}
34|{3EDAAEE9-9CB5-4AE6-AC0A-C183D0716511}|header|header, generic||||MESOZOIC AND PALEOZOIC STRATIGRAPHY|MESOZOIC AND PALEOZOIC STRATIGRAPHY|Mesozoic and Paleozoic|unprovided|Paleozoic|Mesozoic|A thick succession of tilted, faulted, and folded Mississippian through Early Cretaceous marine and continental strata underlies the southwest part of the map area. The Phosphoria Formation (Pp) contains phosphate-rich beds that were historically mined; several adits and abandoned phosphate mines, including the Gravely mine, are located near the contact between the Quadrant and Phosphoria Formations.|06|dmu, header|||||||1|DAS01|||SVUKE|2022-06-02 16:45:43|{3EDAAEE9-9CB5-4AE6-AC0A-C183D0716511}
35|{73501948-6960-497F-BA3D-B8C7040FE5F5}|map unit|map unit, dike|01.03.01|Tdapi|Tdapi|dacite porphyry, intrusion|dacite porphyry, intrusion|Tertiary: Eocene|unprovided|Eocene|Eocene|Porphyritic dike, 2–3 m (7–10 ft) wide, that cross-cuts the Gravely Mountain syncline. Contains phenocrysts of plagioclase, hornblende, and rare quartz in an aphanitic groundmass. The dike is the oldest magmatic unit identified in the map area and yielded a U-Pb zircon age of 51.46 ± 0.25 Ma (table 2).|05-07|dmu, map unit|||{357FE77C-CE31-4317-9AA0-C80AE2CD3FAA}|Fine-grained, intermediate-composition intrusive igneous rock|high||1|DAS01|||SVUKE|2022-06-02 17:44:08|{73501948-6960-497F-BA3D-B8C7040FE5F5}
