Pages authored by Anthony H. Fleming:

1. Surficial Geology / Ice Age in Indiana
   The Ice Age refers to the period of geologic time encompassing the past 2 to 3 million years or so when the earth's higher and mid-latitudes experienced widespread glaciation by huge, continental-scale ice sheets.
2. Data Sets / Gamma-Ray Logs
   Downhole logging of unconsolidated Pleistocene and Holocene materials has long been a component of site-specific engineering, groundwater, and environmental studies conducted by consultants in areas of the midwestern United States and Canada (Bleuer, 2004).
3. Geology / Bedrock Topography
   The bedrock surface in Marion County is composed of Paleozoic stratigraphic units ranging from Silurian to Mississippian age (Hasenmueller, 2003a, b) (fig. 1). These units are composed of shales, siltstones, sandstones, limestones, and dolostones.
4. Geology / Glacial Geology
   The central Indiana landscape is primarily a product of the Pleistocene Epoch of the Quaternary Period, or Ice Age, a period of widespread continental glaciation in which the temperate northern latitudes were repeatedly invaded by large ice sheets.
5. Geology / Hydrogeologic Framework
   Hydrogeology is the study of groundwater and its interaction with the geologic framework, landscape, surface-water bodies, and the human environment. It is both a qualitative and quantitative science having many applications to the modern environment.
6. Geology / Late Wisconsin Glacial Deposits
   Adapted from Fleming and others (1993) and Brown and Laudick (2003) The glacial sediments between the modern land surface of Marion County and the buried pre-Wisconsin surface were deposited during at least three ice advances (fluctuations of the Huron-Erie Lobe) that occurred after about 22,000 years before present (yr B.P.), and...
7. Geology / Bedrock Topography
   The bedrock surface, or topography, in Allen County is erosional in origin and the relief on the bedrock surface is approximately 200 ft.
8. Geology / Drift Thickness
   Unconsolidated sediments of Pleistocene age underlie all of Allen County and range from about 30 ft to more than 300 ft in thickness (Fleming, 1994). Differences in thickness are attributable to as much as 200 ft of relief on the bedrock surface and to variations in the amount of glacial sediments deposited.
9. Geology / Surficial Geology
   Northern Indiana was repeatedly covered by continental ice sheets during the past one million years or so, which produced a thick section of unconsolidated sediments that mantle the bedrock to depths as great as 500 ft.
10. Geology / Water-Table Elevation
    Residents of Allen County rely heavily on groundwater in the underlying strata for drinking water, irrigation, and industrial uses.
11. Data Sets / Gamma-Ray Logs
    Downhole logging of unconsolidated Pleistocene and Holocene materials has long been a component of site-specific engineering, groundwater, and environmental studies conducted by consultants in areas of the midwestern United States and Canada (Bleuer, 2004).