mega_ora Posted February 7, 2016 Share Posted February 7, 2016 Here is a fossil that I would like to identify (reddish-brown). The other fossil (black-ish) was found in the same area and included just as reference. I immediately thought of a horseshoe crab, but haven't found one that matches the shape. In the lower right-hand corner of 'e', it looks like there might have been an outer shell that is mostly gone (revealing vertebrae?). This was found in the St. Louis, Missouri area. Thanks in advance for the help. Link to comment Share on other sites More sharing options...
Raggedy Man Posted February 7, 2016 Share Posted February 7, 2016 Looks like a trilobite pygidium to me. Best regards, Paul ...I'm back. Link to comment Share on other sites More sharing options...
mega_ora Posted February 7, 2016 Author Share Posted February 7, 2016 Thanks, Paul. Much appreciated. Link to comment Share on other sites More sharing options...
Fossildude19 Posted February 7, 2016 Share Posted February 7, 2016 Possibly an Isotelus pygidium. Neat find. Regards, Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Herb Posted February 7, 2016 Share Posted February 7, 2016 trilobite pygidium "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
Jeffrey P Posted February 7, 2016 Share Posted February 7, 2016 1,2, and 5 are definitely a trilobite pygidium. 3 and 4 I see brachiopods and possible trilobite parts. Would be helpful to know the age/formation of the rocks they came from to narrow the choices as far as species/genus. Congratulations on some intriguing finds. Link to comment Share on other sites More sharing options...
mega_ora Posted February 7, 2016 Author Share Posted February 7, 2016 Thanks everyone! Looks like it is definitely trilobite pygidium. These were found in a creek bed. Surrounding the creek are small dolomite and limestone bluffs. The area is very rocky in the Missouri Ozarks genre. I am not very technical when it comes to geology, but there are many kinds of stone, including limestone, flint, dolomite, and lots of sea-fossils. Link to comment Share on other sites More sharing options...
cck Posted February 8, 2016 Share Posted February 8, 2016 Trimerus ? Link to comment Share on other sites More sharing options...
piranha Posted February 8, 2016 Share Posted February 8, 2016 As Tim mentioned, the pygidium is Isotelus. The Ordovician Kimmswick Limestone extends from Jefferson into St. Louis County. There are a few different isoteline species from the Kimmswick LS. This one is similar to Isotelus gigas or Isotelus kimmswickensis. Isotelus gigas is attached for comparison: 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now