The Gossman Mentorship
(about us)

    

Geology
Go straight to photos

Ichthyology

Focus

 

The focus of the Geology/Cartography group was originally to map the structural geology of the farm in Zwingle, Iowa; however, due to the interests of several group members, the research shifted to studying the rock layers in the bluffs and excavating different types of rocks and fossils. The goal of this investigation is ultimately learn about the time period that these rocks were formed in.

 

Geologic Hammer
(courtesy of http://www.gnb.ca/0130/MineralsMatter/proppect.htm)

Methods and Materials

 

Under the supervision of IMSA faculty member Dr. Mark Horrell, the geology group used FGIS, a free software-mapping program, to chart the geography of the land. For the excavation portion, the members used geologic hammers to remove both weathered and fresh rock samples, along with excavating fossils.

 

 

 

Findings

 As of now, the group has discovered Dolomite and Limestone in the retrieved rock samples. Fossils include tabulate corals, Crinoids from the phylum Echinodermata, and traces of various bivalves. This findings show that these rocks were formed during the Silurian time period.

Coral Tabulate
(courtesy of
http://www.uky.edu/OtherOrgs/KPS/pages/fossilphoto.html)

Crinoids
(courtesy of
http://www.rankinmuseum.com/
paleontology_page.htm)

dolomite
(courtesy of
http://www.francesjane.com/
dolomite.html)

 

 

limestone
(courtesy of
http://www.uwsp.edu/geo/faculty
/ritter/glossary/S_U/sedimentary_
rock.html)

Bivalve
(courtesy of
http://plato.acadiau.ca/Courses/geol/
Cameron/GEOL2213/GEOL2213-Lab%20Specimen%20Photos/
Mollusca/Paleo43-paleolab8g%20D%20Bivalves%20with%
20some%20cephalopods)


(courtesy of http://universe-review.ca/Frame.htm)

More information on the Silurian period

 During the Silurian, around 45% of the Earth was covered in water, which allowed for a wide variety of marine life. Due to the warm climate, a large rise in coral populations occurred. These high temperatures suggest that Iowa used to be situated within thirty degrees of the equator.

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Geology Photographs
Click on image for larger view

Week of November 5-7
An inner view of one of the caves A view of the old schoolhouse site, which was used last year as an 
        archeological site The geology team planning their day's work
An inner view of one of the caves

 

A view of the old schoolhouse site, which was used last year as an archeological site

 

The geology team planning their day's work

 

The geology team preparing for work The geology team taking GPS readings to map the the land The geology team sweeps the land while mapping
The geology team preparing for work

 

The geology team taking GPS readings to map the the land

 

The geology team sweeps the land while mapping

 

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Week of October 15-17

One of the caves found on the Gossman farm

Another cave found on the Gossman farm

One of the caves found on the Gossman farm

 

Another cave found on the Gossman farm

 

A cliff found on the Gossman farm, sporting several caves

The side of a cliff, showing evidence of erosion from long ago

A cliff found on the Gossman farm, sporting several caves

 

The side of a cliff, showing evidence of erosion from long ago

 

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(c)  Jessica Liu and Yifan Sun

 
 

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