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C. Robert Reszka, Jr.


I can answer any general geology question (rocks, minerals, stratigraphy, geomorphology etc.). My expertise is in the geology of the Michigan Basin, PreCambrian, Paleozoic and Recent. I can answer questions concerning mining and petroleum exploration and production and the laws concerning those activities. I can also answer questions concerning stratigraphy of the Michigan Basin. I will also answer questions about mineral and rock collecting in the Basin. I won`t be able to answer many specific questions on hydrology, geophysics or geochemistry. I may be able to answer very general questions in those venues.

Experience in the area

I have been working for the State of Michigan for 36 years as a Geologist and a Resource Analyst. I have experience with Subsurface Geology and Petroleum Geology, mining in Michigan, and Sand Dune Mining and Protection issues.


Michigan Basin Geological Society


Decade of North American Geology.
Bedrock Geology of Michigan


BS Wayne State University

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Jim03/29/16101010Thank you! I appreciate your expertise and .....
Kristina02/02/16101010Thank you very much if there is .....
Deb Tiller08/11/15101010My sister has a Masters in Forestry .....
Feenie06/27/15101010thank you for your answer. my fiance' .....
Jaimie 05/27/15101010Thanks again for the wonderful information.

Recent Answers from C. Robert Reszka, Jr.

2016-11-28 Is this obsidian? Volcanic rock?:

Hi Christopher,  VERY interesting specimen!  It does look very "obsidian-like" but the location speaks strongly against that.  It would be very unlikely to find obsidian in Michigan.  There are volcanic

2016-09-04 Can you identify?:

Hi Richard,  Interesting specimens.  You don't mention where you got these from so I can't be sure of an I.D. but I think the 16" boulder appears to have unconnected holes and longitudinal depressions

2016-05-23 Mineral question:

Hi Tammy,  It looks like you have some samples of a metamorphic rock called a "gneiss". That's a rock that has undergone a lot of temperature and pressure; enough to change it physically and mineralogically

2016-03-28 Unknown object:

Hi Jim,  Looks like you have a rather nice piece of "chalcedony".      Chalcedony is a cryptocrystalline silica mineral made mostly of quartz (SiO2).  It's usually translucent and looks waxy.  Like quartz

2016-01-25 what are these crystallized rocks?:

Hi Kristina,  I was thinking you specimens might be pyrite or marcasite but your description of a silver color and the pictures makes me pretty certain you have metallic slag.  That's the waste product


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