References_Cited:
Soller, D.R., 1992, Text and references to accompany "Map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains": U.S. Geological Survey Bulletin 1921, 54 p.
-----1993a, Map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains--Northeastern States, the Great Lakes, and parts of southern Ontario and the Atlantic offshore area (east of 80deg 31min West longitude): U.S. Geological Survey Miscellaneous Investigations Series Map I-1970-A, scale 1:1,000,000.
-----1993b, Preliminary map showing the thickness and character of Quaternary sediments in the United States east of the Rocky Mountains: U.S. Geological Survey Open-File Report 93-543, scale 1:3,500,000.
-----1994, Map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains--Northern Plains States (west of 102deg West longitude): U.S. Geological Survey Miscellaneous Investigations Series Map I-1970-D, scale 1:1,000,000.
-----1998, Map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains--Northern and Central Plains States (90deg to 102deg West longitude): U.S. Geological Survey Miscellaneous Investigations Series Map I-1970-C, scale 1:1,000,000.
-----in press, Map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains--Northern Great Lakes States and central Mississippi Valley States, the Great Lakes, and southern Ontario (80deg 31min to 93deg West longitude): U.S. Geological Survey Miscellaneous Investigations Series Map I-1970-B, scale 1:1,000,000.
Soller, D.R., and Berg, R.C., 1992, Using regional geologic information to assess relative aquifer contamination potential--an example from the central United States: U.S. Geological Survey Open-File Report 92-694, scale 1:1,000,000.
Soller, D.R., and Packard, P.H., 1998, Digital representation of a map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains: U.S. Geological Survey Digital Data Series DDS-38, one CD-ROM.
Soller, D.R., Stettner, W.R., Lanfear, K.J., and Aitken, D.S., 1990, A user's manual for a method of map scanning and digital editing for thematic map production and data-base construction: U.S. Geological Survey Circular 1054, 38 p.
Digital cartography for base map files by: Wai-See Moy and David R. Soller (assisted by Patricia H. Packard)
NOTE 1: contributors to individual quadrangles or data files are not specified. NOTE 2: persons assisting with geology files are listed alphabetically after the first contributor (K.J. Lanfear).
Geologic "CODE" values are listed below in "GEOLTABLE" under "Entity_and_Attribute_Detail _Citation" for reference, although these geologic attributes are not found in any of the base data layers.
CODE DESCRIPTION
0 no data
1 contact between sediment units at the land surface
2 contact between areas of patchy and continuous sediment
3 contact in Delaware Valley where glacial origin uncertain
4 contact between sediment unit and unmapped areas under water
5 arbitrary extent of mapped area
7 boundary between no data and mapped or water areas
101 coarse-grained stratified sediment
102 fine-grained stratified sediment
103 till
104 patchy Quaternary sediment
105 exposed bedrock or sediment not of glacial origin
106 organic-rich sediment
107 water where no geologic data are shown
201 Quaternary sediment 0-50 ft thick
202 Quaternary sediment 50-100 ft thick
203 Quaternary sediment 100-200 ft thick
204 Quaternary sediment 200-400 ft thick
205 Quaternary sediment 400-600 ft thick
206 Quaternary sediment 600-800 ft thick
207 Quaternary sediment 800-1000 ft thick
208 Quaternary sediment 1000-1200 ft thick
209 Quaternary sediment 1200-1400 ft thick
210 Quaternary sediment 1400-1600 ft thick
211 Quaternary sediment more than 1600 ft thick
300 areas enclosed by mapped veneer or buried units
301 significant mapped area of buried coarse-grained strat. sed.
302 veneer of coarse-grained stratified sediment
303 significant mapped area of buried fine-grained strat. sed.
304 veneer of fine-grained stratified sediment
305 significant mapped area of buried till
306 veneer of till
307 veneer of loess more than 20 ft thick
308 veneer of organic-rich sediment
401 drumlins and other elliptical landforms shaped by moving ice
402 isolated outcrops of pre-Woodfordian drift in Pennsylvania
403 location of selected lithologic logs -- see Soller (1993a, 1994,
and in press a,b)
404 maximum extent of glacial ice
405 maximum extent of glacial ice during the Late Wisconsinan
406 maximum extent of Late Wisconsinan marine transgression
407 approximate maximum extent of Late Wisc. marine transgression
408 projected position of Late Wisc. lake levels in MT and ND