Talk:Yorktown Formation

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I have a two questions about this page: the first has to do with indicating that the Yorktown Formation underlies the Croatan Formation -- from what I can find in the research that is only true in North Carolina, and there are many other formations that overlie the Yorktown Formation (for example, where that picture posted was taken I believe is either where the Shirley Formation overlies or where the Norfolk Formation overlies (it's captioned as being near Carters Grove Bluff so from what I know it could be either depending on exactly where this was taken); the second question has to do about the Yorktown Formation extending to South Carolina -- the USGS survey information that I've found indicate it going to North Carolina, but not South Carolina. So I guess that what I'm asking is whether Jstuby can provide any references for what was posted here? Drdan01 (talk) 15:54, 5 November 2010 (UTC)

My experience with the Yorktown is limited to the field trip I took in 2001, and from which all the pictures I uploaded about the Yorktown come. Other than the field trip guide in the references, all the other references are from the USGS GEOLEX (http://ngmdb.usgs.gov/Geolex/NewUnits/unit_4487.html). USGS recognizes the formation as part of the Chesapeake Group in MD, VA, and NC, and as a formation without a group in SC. If you are aware of a change in nomenclature in SC by all means document it here. With regard to your first question, if you know of lateral changes in stratigraphy that I've not documented where the Yorktown is underlain by something other than what I've listed, please expand the article. The infobox is useful as a first-order explanation, but geology is not as simple as the infobox. Hope this helps, and good luck expanding the article. I'll be happy to read more about it. Jstuby (talk) 20:17, 6 November 2010 (UTC)

Notable Exposures: Could someone check whether the clay scallop fossils pointed to below, also qualify as a notable exposure? https://maps.google.com/maps?q=Sleepy+Hole+Park,+Suffolk,+VA&hl=en&ll=36.84183,-76.522564&spn=0.000814,0.001263&sll=38.003385,-79.420925&sspn=4.639537,10.349121&oq=sleepy+hole+park&hq=Sleepy+Hole+Park,+Suffolk,+VA&t=h&z=2012.160.67.170 (talk) 23:54, 22 July 2013 (UTC)MJR

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