Preliminary Map Showing Quaternary Geology of the Trafalgar 7.5-Minute Quadrangle, Indiana
نویسندگان
چکیده
The Trafalgar 7.5-minute quadrangle is situated near the maximum limit of Wisconsin Episode glacial deposits insouthwestern Johnson County. Till age (Trafalgar Formation) dominates surficial geology thequadrangle. Minor areas outwash and colluvium are found in valleys former meltwater pathways.Kame (sand gravel) northeast part a larger kame complexpresent central Holocene (post-glacial) alluvium North South Prongsof Stotts Creek tributaries. It also two tributary (Barnes Goose Creek) Indian inthe southwestern sector quadrangle. Unconsolidated sediment thickness generally increases from west to east acrossthe quadrangle, less than 15 ft along western margin over 150 thick east-central ofthe transition bedrock topography represents buried northern end KnobstoneEscarpment. Based on water well data, half highly variable (reliefof ca. 75 ft), similar that bedrock-dominated immediately south Brown Thequadrangle underlain entirely by Mississippian Borden Group bedrock. locatedless one mile southern boundary Radiocarbon ages an exposure Lick Creeksouth indicate Laurentide Ice Sheet reached its extent just after 23,700 years ago. A second glaciallimit, marked Crawfordsville Moraine, crosses northwest southeast. TheCrawfordsville Moraine readvance which occurred 21,700 This preliminary geologic mapis interim map product documents progress mapping Quaternary County,Indiana. lithologic classification units Indiana was used assigning units.
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ژورنال
عنوان ژورنال: Indiana journal of earth sciences
سال: 2021
ISSN: ['2642-1550']
DOI: https://doi.org/10.14434/ijes.v3i1.31737