Columbus Junction, Louisa Co., Iowa, USA
| Latitude & Longitude (WGS84): | 41° 16' 43'' North , 91° 21' 35'' West |
|---|---|
| Latitude & Longitude (decimal): | 41.27864,-91.35988 |
| Köppen climate type: | Dfa : Hot-summer humid continental climate |
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Mineral List
Mineral list contains entries from the region specified including sub-localities2 valid minerals.
Regional Geology
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
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| Frasnian 372.2 - 382.7 Ma ID: 3003047 | Lime Creek Formation Age: Late Devonian (372.2 - 382.7 Ma) Stratigraphic Name: Lime Creek Formation Description: Interval includes Sweetland Creek Shale in southeast Iowa, and “Amana beds” of Iowa County. Lime Creek Fm onlaps eroded Ordovician surface in northwestern Iowa. Primary Lithologies: shale, gray to green-gray, dolomitic to calcareous; limestone, variably argillaceous, fossiliferous, part biostromal; dolomite, variably argillaceous, part fossiliferous. Secondary Lithologies: limestone, dense, “sublithographic” (upper part of carbonate-dominated facies in central and northwestern Iowa); shale, green-gray to brown, silty (Sweetland Creek Shale). Minor: siltstone; chert; oolitic limestone, carbonate breccia (central to northwestern Iowa). Thickness variations in outcrop belt: Sweetland Creek Shale of southeastern Iowa, 3-30 ft (1-9 m); Lime Creek Fm of southeastern to north-central Iowa, 40-200 ft (12-60 m); Lime Creek Fm of northwestern Iowa, 200-350 ft (60-105 m). Lithology: Major:{shale,limestone,dolostone}, Incidental:{siltstone, chert, sedimentary breccia} Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133] |
| Frasnian 372.2 - 382.7 Ma ID: 2162193 | Lime Creek Formation Age: Late Devonian (372.2 - 382.7 Ma) Description: Interval includes Sweetland Creek Shale in southeast Iowa, and "Amana beds" of Iowa County. Lime Creek Fm onlaps eroded Ordovician surface in northwestern Iowa. Primary Lithologies: shale, gray to green-gray, dolomitic to calcareous; limestone, variably argillaceous, fossiliferous, part biostromal; dolomite, variably argillaceous, part fossiliferous. Secondary Lithologies: limestone, dense, "sublithographic" (upper part of carbonate-dominated facies in central and northwestern Iowa); shale, green-gray to brown, silty (Sweetland Creek Shale). Minor: siltstone; chert; oolitic limestone, carbonate breccia (central to northwestern Iowa). Thickness variations in outcrop belt: Sweetland Creek Shale of southeastern Iowa, 3-30 ft (1-9 m); Lime Creek Fm of southeastern to north-central Iowa, 40-200 ft (12-60 m); Lime Creek Fm of northwestern Iowa, 200-350 ft (60-105 m). Reference: Witzke, B.J., R.R. Anderson, J.P. Pope. Iowa Bedrock Geologic Map. Iowa Geological and Water Survey, DNR. [26] |
Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License
Localities in this Region
- Iowa
- Louisa Co.
- Columbus Junction
- Louisa Co.
