Just prior to graduation I submitted an abstract entitled, “Interpretation of a Paleo-Inlet’s Depositional History: A Ground Penetrating Radar Investigation, Grand Island, MI.” I presented this research using power point as a medium. A previous analysis of a 50MHZ Ground Penetrating Radar (GPR) subsurface profile of the entire Grand Island Tombolo revealed a depositional feature displaying channel fill reflection patterns near the center of the tombolo and beneath the modern strandplain.
This author hypothesized that this feature could be a Paleo-inlet which existed prior the deposition of the modern strandplain and formation of the tombolo. A higher resolution (100MHZ) GPR profile of this feature was collected to allow for a more detailed analysis. The content presented in Madison displays evidence pointing to the existence of channel like conditions in the proposed paleo-inlet through the use of radar stratigraphic analysis.
A paleo-geographic reconstruction of the Grand Island Tombolo was created based on the authors understanding of lake level chronology, regional geology, and and applied radar stratigraphy. This reconstruction is meant to provide a base illustration which I hope will foster future discussion, decomposition of current hypothesis, and construction of new hypothesis.
My full PowerPoint presentation can be accessed below. Enjoy!
My research partner and co-author, Sean Morrison, is currently working on a paper regarding this topic in addition to studying as a master’s student at University of Waterloo in Canada under the direction of John Johnston. Future research by this author will be released on this blog.