shark57 Posted November 14, 2013 Share Posted November 14, 2013 (edited) Went collecting in one of my favorite Miocene localities last week. Didn't find a lot, but did find this interesting shark tooth in situ in the mid-Miocene Choptank formation. Looks like a good match for Isurus escheri, which is generally considered a European species. It even has the small cusplets that European escheri usually have. I have never seen it documented over here in any publications, but there is really no good reason it couldn't cross the Atlantic. I have seen a few others, but they were generally beach found, without good stratigraphic data. I would be curious to see serrated makos that others have found in the Eastern U.S. Edited November 20, 2013 by shark57 Link to comment Share on other sites More sharing options...
John Hamilton Posted November 14, 2013 Share Posted November 14, 2013 Very nice Link to comment Share on other sites More sharing options...
Al Dente Posted November 14, 2013 Share Posted November 14, 2013 Nice tooth. The Elasmo website mentions anecdotal reports being made of I. escheri teeth found in the Upper Calvert- Lower Choptank Formation. The Lee Creek volume 3 publication shows a picture of an Isurus xiphodon with "incipient serrations" from the Yorktown Formation (fig 28, page 118). I have seen a photograph of a large mako from Greens Mill Run that had serrations. The serrations on the GMR tooth were unusual and could have been more a pathology than real serrations. Link to comment Share on other sites More sharing options...
MarcoSr Posted November 14, 2013 Share Posted November 14, 2013 Gary Really nice tooth! As I've told you, Mel has a real nice in situ specimen from the Choptank Formation with cusplets and serrations. He also has two in situ specimens from the Calvert Formation. Your specimen and Mel's would be a good subject for a paper. Marco Sr. "Any day that you can fossil hunt is a great day." My family fossil website Some Of My Shark, Ray, Fish And Other Micros My Extant Shark Jaw Collection Link to comment Share on other sites More sharing options...
Auspex Posted November 14, 2013 Share Posted November 14, 2013 Wow! This is a terrific find! "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...
sixgill pete Posted November 14, 2013 Share Posted November 14, 2013 WOW! Very nice tooth. Congrats on an amazing find!!!! Bulldozers and dirt Bulldozers and dirt behind the trailer, my desert Them red clay piles are heaven on earth I get my rocks off, bulldozers and dirt Patterson Hood; Drive-By Truckers May 2016 May 2012 Aug 2013, May 2016, Apr 2020 Oct 2022 Link to comment Share on other sites More sharing options...
shark57 Posted November 14, 2013 Author Share Posted November 14, 2013 Nice tooth. The Elasmo website mentions anecdotal reports being made of I. escheri teeth found in the Upper Calvert- Lower Choptank Formation. The Lee Creek volume 3 publication shows a picture of an Isurus xiphodon with "incipient serrations" from the Yorktown Formation (fig 28, page 118). I have seen a photograph of a large mako from Greens Mill Run that had serrations. The serrations on the GMR tooth were unusual and could have been more a pathology than real serrations. Thanks for your comments. I am very familiar with Elasmo.com as I have supplied Jim B. with many specimens to photograph. After a quick check, I couldn't find any reference to Calvert or Choptank escheri. Can you tell me where on the web site this is? I have a copy of Lee Creek 3, I'll have to pull it out. If this tooth occurs in the Calvert, that predates the earliest European occurrence. That means this species may have originated on this side of the Atlantic, or this is a totally different attempt by the makos to develop serrations and should not be referred to I. escheri. Either way makes for interesting discussion. Link to comment Share on other sites More sharing options...
Al Dente Posted November 15, 2013 Share Posted November 15, 2013 Thanks for your comments. I am very familiar with Elasmo.com as I have supplied Jim B. with many specimens to photograph. After a quick check, I couldn't find any reference to Calvert or Choptank escheri. Can you tell me where on the web site this is? I have a copy of Lee Creek 3, I'll have to pull it out. If this tooth occurs in the Calvert, that predates the earliest European occurrence. That means this species may have originated on this side of the Atlantic, or this is a totally different attempt by the makos to develop serrations and should not be referred to I. escheri. Either way makes for interesting discussion. You can find it by getting into the Slide Show section, click on the one titled "C. Carcharias time and place" go to the Mio-plio page and toward the bottom there is a paragraph called Anecdotal Reports. Link to comment Share on other sites More sharing options...
shark57 Posted November 15, 2013 Author Share Posted November 15, 2013 You can find it by getting into the Slide Show section, click on the one titled "C. Carcharias time and place" go to the Mio-plio page and toward the bottom there is a paragraph called Anecdotal Reports. Thanks, found it. I've read that page numerous times and didn't remember the reference to Calvert/Choptank specimens. Seems like he concludes that they exist, are rare, and he has never seen a well documented specimen. He should be interested in this tooth. Link to comment Share on other sites More sharing options...
Mudduck Posted November 15, 2013 Share Posted November 15, 2013 Wow! What a find. Candidate for FOM? Link to comment Share on other sites More sharing options...
jcbshark Posted November 15, 2013 Share Posted November 15, 2013 WOW beautiful tooth.Congrats on a great find. Every once in a great while it's not just a big rock down there! Link to comment Share on other sites More sharing options...
MakoMeCrazy Posted November 16, 2013 Share Posted November 16, 2013 Sweet find! Incredible! Link to comment Share on other sites More sharing options...
busyeagle Posted November 18, 2013 Share Posted November 18, 2013 It'd be neat to assemble some pictures of other escheri from the eastern US. I did a quick search of the forum and saw that bmorefossil posted a couple from the Calvert (including one very convincing lower that looks fairly similar to yours) in this thread. Link to comment Share on other sites More sharing options...
cowsharks Posted November 18, 2013 Share Posted November 18, 2013 I've personally seen slightly serrated mako's from Calvert Cliffs in the collection of a fellow collector. They were collected in the Southern portion of the cliffs in either the St. Mary's or Choptank formation. Daryl. Link to comment Share on other sites More sharing options...
gwbh Posted November 19, 2013 Share Posted November 19, 2013 interesting ive never heard of them being found anywhere besides south america Link to comment Share on other sites More sharing options...
Hieronymus Posted November 30, 2013 Share Posted November 30, 2013 interesting ive never heard of them being found anywhere besides south america South America? That would be the semi-serrated C. hastalis which is the link between hastalis and Great White. Escheri is not an intermediary species between hastalis and GW http://rhaetianlorraine.webs.com/ Link to comment Share on other sites More sharing options...
patrick hendriks Posted December 1, 2013 Share Posted December 1, 2013 Here are some escheri's from the Netherlands. Some of these even have sidecusps. It depends from wich layer they are coming. Here we have several different types, broad, small and with and without sidecusps. even with heavy serrations or just very fine. Link to comment Share on other sites More sharing options...
patrick hendriks Posted December 1, 2013 Share Posted December 1, 2013 Here are some more even one with dubble sidecusps Link to comment Share on other sites More sharing options...
erik m Posted December 1, 2013 Share Posted December 1, 2013 Here is also a escheri from Mill (Netherlands) 1 Link to comment Share on other sites More sharing options...
shark57 Posted December 3, 2013 Author Share Posted December 3, 2013 Thanks for the post of those escheri from the Netherlands. I would like to know the age of those specimens. It certainly seems to be more common over there. How often do you find them? Link to comment Share on other sites More sharing options...
erik m Posted December 4, 2013 Share Posted December 4, 2013 the are from the miocene. Whe did find them a lot in Mill bud the site is not there anymore 1 Link to comment Share on other sites More sharing options...
RCFL Posted December 31, 2014 Share Posted December 31, 2014 I know this is an older thread but I actually found a serrated mako about 6 months ago in the Peace River. I didn't notice the serrations until I brought it back and showed it to my friend who was shocked! Blurry but shows the upper serrated portion very good b/c of the way the light reflects: 1 Link to comment Share on other sites More sharing options...
shark57 Posted December 31, 2014 Author Share Posted December 31, 2014 Thanks for the post and pics. That's the first one I've seen from Florida. Link to comment Share on other sites More sharing options...
Hunt4teeth Posted December 31, 2014 Share Posted December 31, 2014 Congrats on such a rare and amazing find! Jay Link to comment Share on other sites More sharing options...
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