The Bedrock Geology of Iowa (Dr. Raymond Anderson)
The Bedrock Geology of Iowa (Dr. Raymond Anderson)
The Bedrock Geology of Iowa (Dr. Raymond Anderson)
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James Hall & J.D. Whitney, 1857<br />
first Geological Survey <strong>of</strong> <strong>Iowa</strong><br />
C.A. White, 1870<br />
Second Geological Survey <strong>of</strong> <strong>Iowa</strong><br />
S. Calvin , 1907<br />
first permanent <strong>Iowa</strong> Geological Survey<br />
A.C. Tester, 1937<br />
<strong>Iowa</strong> Geological Survey<br />
G.H. Hershey, 1969<br />
most recent <strong>Iowa</strong> Geological Survey
G.H. Hershey, 1969, most recent <strong>Iowa</strong> Geological Survey<br />
reprint<br />
or<br />
remap
2005-2009<br />
2001 project<br />
completion<br />
date<br />
September 2004
68,529 data points<br />
Location <strong>of</strong> GEOSAM Data Points
mapping geology on bedrock topography<br />
BEDROCK ELEVATION<br />
GEOLOGY
THE DATA<br />
<strong>Bedrock</strong> exposures and quarry info from IGWS records and publications<br />
<strong>Bedrock</strong> exposures and quarry info from project field work<br />
Well data from IGWS records<br />
Well data from drillers’ logs<br />
Well data from other sources<br />
DOT bridge boring data<br />
County Soils Maps
1969<br />
2009<br />
Unit A<br />
Unit B<br />
<strong>Bedrock</strong> Topography and<br />
<strong>Bedrock</strong> Geologic Maps
<strong>Bedrock</strong> Topography in <strong>Iowa</strong> 2009<br />
12 years and 4,300,000 verticies
<strong>Bedrock</strong> <strong>Geology</strong> <strong>of</strong> <strong>Iowa</strong> 2009
<strong>Bedrock</strong> <strong>Geology</strong> <strong>of</strong> <strong>Iowa</strong> 2009
<strong>Bedrock</strong> <strong>Geology</strong> <strong>of</strong> <strong>Iowa</strong> 2009
1969
Sioux<br />
Quartzite<br />
(1,600 ma)<br />
Niobrara<br />
Formation<br />
Dakota<br />
Formation<br />
~1,500 ma<br />
Fort<br />
Benton<br />
Group<br />
(85 ma)<br />
CRETACEOUS<br />
Niobrara Fm.<br />
Fort Benton Gp.<br />
Carlile Sh.<br />
Greenhorn Ls.<br />
Graneros Sh.<br />
Dakota Fm.<br />
Woodbury Mbr.<br />
Nishnabotna Mbr.
Cretaceous<br />
undifferentiated<br />
1969
Cretaceous<br />
Manson<br />
Impact<br />
Structure
Manson<br />
Impact<br />
Structure<br />
1969
Crater<br />
Moat<br />
Central<br />
Peak<br />
Manson<br />
Impact<br />
Structure<br />
Terrace<br />
Terrane
Fremont<br />
Channel
Fremont<br />
Channel<br />
TOPOGRAPHIC MAP
2009<br />
Fremont<br />
Channel
Fremont<br />
Channel<br />
1969
Fremont<br />
Channel
1969
Thurman-Redfield<br />
Structural Zone<br />
2009
1969
<strong>Bedrock</strong> <strong>Geology</strong> <strong>of</strong> <strong>Iowa</strong> 2009
Cleona<br />
Channel<br />
Elevation <strong>of</strong> the<br />
<strong>Bedrock</strong> Surface<br />
Gordon<br />
Channel
<strong>Bedrock</strong> Topography
1969
Elevation <strong>of</strong> the bedrock surface <strong>of</strong> <strong>Iowa</strong> – line coverage<br />
contour interval = 50 feet
Elevation <strong>of</strong> the bedrock surface <strong>of</strong> <strong>Iowa</strong><br />
2009
<strong>Iowa</strong> Digital Elevation Model<br />
<strong>Iowa</strong> Geological Survey GIS Section<br />
1670’<br />
420’
COUNTY MAPS
Statewide Coverage<br />
<strong>Bedrock</strong> <strong>Geology</strong> <strong>of</strong> <strong>Iowa</strong><br />
Elevation <strong>of</strong> the <strong>Bedrock</strong> Surface<br />
Depth to the <strong>Bedrock</strong> Surface<br />
County Coverage<br />
<strong>Bedrock</strong> <strong>Geology</strong> <strong>of</strong> <strong>Iowa</strong><br />
Elevation <strong>of</strong> the <strong>Bedrock</strong> Surface<br />
Depth to the <strong>Bedrock</strong> Surface<br />
line polygon pdf<br />
line gridded pdf<br />
line gridded pdf<br />
line polygon pdf<br />
line gridded pdf<br />
line gridded pdf
Thanks,<br />
Ray <strong>Anderson</strong> &<br />
Brian Witzke
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