Auspex Posted August 3, 2014 Share Posted August 3, 2014 To have a K-Pg boundary, you need to have Paleocene deposits conformably overlying Cretaceous deposits, and to visit it, it has to be exposed. For a depressingly large percentage of the planet, this is a rare set of circumstances. 1 "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Bev Posted August 3, 2014 Share Posted August 3, 2014 Holy Camole, I'm on a Cretaceous line! We are supposed to have shark's teeth just 6 miles west of me! Will have to read that pdf in depth, but got to go put up a European elk mount on the barn right now. The more I learn, I realize the less I know. BluffCountryFossils.NET Fossil Adventure Blog Go to my Gallery for images of Fossil Jewelry, Sculpture & Crafts Pinned Posts: Beginner's Guide to Fossil Hunting * Geologic Formation Maps Link to comment Share on other sites More sharing options...
painshill Posted August 3, 2014 Share Posted August 3, 2014 (edited) Hi Bev Auspex is quite right, and I don't think the boundary is visible in the States you mentioned, nor in your immediate vicinity. I recall that there is a site in New Jersey where it's visible (but haven't checked my reference papers for exactly where) and would guess that's the "nearest" to you. Incidentally, Iowa has an impact structure (a subsurface crater near Manson) which was at one time believed to be the KT impact site (before we understood Chicxulub). Although originally believed to be the right age, it's too small, with the impactor believed to be about 2km across (versus 10km plus for Chicxulub). After Chicxulub was understood it was then believed to be a related impact from a fragment of the same asteroidal body and is still reported as such in some sources. Modern dating has however put the impact 10 million years before Chicxulub and the impactor seems to have been a stony meteorite rather than (probably) a carbonaceous chondrite as at Chicxulub. There's nothing visible at the surface though, apart from fragments of shocked minerals. Edited August 3, 2014 by painshill Roger I keep six honest serving-men (they taught me all I knew);Their names are What and Why and When and How and Where and Who [Rudyard Kipling] Link to comment Share on other sites More sharing options...
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