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Welcome to the October 2007 edition of e-GeoNews. Please plan to visit us at the IGS or the Indiana State Museum during Earth Science Week---October 14-20.

Trilobite fossil
Earth Science Week: Oct. 14-20
Each fall the IGS teams up with the American Geological Institute to promote the earth sciences.

IGS Open House: Oct. 15-18
During Earth Science Week, the IGS invites visitors to view displays in the Geological Survey and the adjoining Department of Geological Sciences. Displays feature many aspects of earth science, including Indiana fossils, minerals, caves, coal mining, mapping and cartography, limestone quarrying, and much more.

GeoFest: Oct. 19-20
Stop by our booth at this Indiana State Museum event to dig for fossils and receive a free poster.

Geological Society of America: Oct. 28-31
Several IGS staff are presenting their research at this conference. View their abstracts online.

Minerals Workshop: Nov. 1-2
The Indiana Department of Natural Resources, Division of Reclamation is hosting this 2-day workshop for Indiana educators.

Earth Science Week Toolkit. Click to link to the IGS Bookstore.
Earth Science Week Toolkit for Teachers
Free kits for Indiana K-12 science teachers include a calendar, posters, fliers, and CDs. Information in the kit is provided by the U.S. Geological Survey, NASA, the Geological Society of America, the National Oceanic and Atmospheric Administration, and Environmental Systems Research Institute.

Graph from nitrate contamination project. Click to view the full report.
Evaluating Agricultural Practices to Remediate Nitrate Contamination of Ground Water
by Denver Harper and Edwin Hartke

In Indiana, there are extensive agricultural areas developed on deposits in floodways of major streams, and on outwash fans and wind-blown sands. Infiltration is rapid in these hydrogeologic settings, so that ground water is subject to degradation by nitrates from a variety of sources. A previous investigation in Jackson County, Indiana, indicated that denitrification occurs as ground water migrates downward, so that shallow aquifers in such settings are candidates for remediation.

In a recent investigation, several agricultural practices were evaluated to determine if nitrate concentrations in ground water could be reduced. Water chemistry was monitored in six test plots. The practices that were employed included: systematic reductions in the application of nitrogen fertilizers, application of nitrogen stabilizers, and aerial seeding of rye in corn fields late in the growing season.

The results indicate that large reductions in the application of nitrogen fertilizers (from 185 to 80 lbs/acre) can be effected with relatively small reductions (about 11 bushels/acre) in corn yields. Also, when nitrogen stabilizers were used, concentrations of nitrates in ground water decreased in the postapplication round of sampling. The attempt to evaluate the effects of planting a cover crop of rye was inconclusive.

The project, conducted between October 2003 and October 2007, was funded by the Section 319 Program, Indiana Department of Environmental Management.
Bedrock Geology of Indiana. Click to link to the IGS Bookstore.
Bedrock Geology Map
Looking for information about Indiana geology? The IGS Web site is the perfect resource. You can find basic information about the structure of Indiana's bedrock geology and view maps and diagrams on the Indiana Bedrock Geology page.

If you need a map for your office or classroom, the IGS Bookstore is your solution. We offer several large-format color maps that provide eye-catching views into Indiana's geologic past.

In all, our online bookstore includes more than 2,000 maps and publications, and our new topic-based "quick links" and better search capability make it easier than ever to find what you're looking for.
After 5 years of service to the organization, Wilfrido Solano left the IGS to pursue a career with Chevron Oil Company in Houston, Texas.

Cristian Medina, who recently graduated with a Master of Science in Geology from Indiana University, has taken over Wil's position as research geologist in the Subsurface Geology Section. Cristian will be working on geologic carbon sequestration in the Illinois Basin.

On October 22nd, a new hydrogeologist will join the IGS. Shawn Naylor comes to us from the Montana Department of Natural Resources and Conservation, where he served as a Water Resource Specialist. Shawn received a B.S. degree in environmental science from IU and a masters in geology from the University of Montana.

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