PRK Posted December 29, 2016 Share Posted December 29, 2016 Just ran across this interesting and unusual fossil. It's been in storage for over 40 years. I collected it on a 3 day field trip in my freshman year in college, and can't find its ID anywhere--- even google. Any help? Link to comment Share on other sites More sharing options...
Darktooth Posted December 29, 2016 Share Posted December 29, 2016 Before I zoomed in for a closeup I was thinking Horn coral. But upon closer inspection this appears to be something else. Can you tell where it was found, and the age of formation? I like Trilo-butts and I cannot lie. Link to comment Share on other sites More sharing options...
PRK Posted December 29, 2016 Author Share Posted December 29, 2016 You are correct! It is not a coral of any kind. mexico Link to comment Share on other sites More sharing options...
Missourian Posted December 29, 2016 Share Posted December 29, 2016 Rudist? Whatever it is, it's cool looking. 1 Context is critical. Link to comment Share on other sites More sharing options...
abyssunder Posted December 29, 2016 Share Posted December 29, 2016 I'm wondering if couldn't be a rudist with the two valves still attached, like the one below. picture from here " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
PRK Posted December 29, 2016 Author Share Posted December 29, 2016 Yes! That's it. Have they reassigned the genus since then? Link to comment Share on other sites More sharing options...
abyssunder Posted December 30, 2016 Share Posted December 30, 2016 I don't know if the genus Coralliochama was reassigned or not, but it was reviewed, according to LOUIE MARINCOVICH, JR. 1975. MORPHOLOGY AND MODE OF LIFE OF THE LATE CRETACEOUS RUDIST, CORALLIOCHAMA ORCUTTI WHITE (MOLLUSCA: BIVALVIA). JOURNAL OF PALEONTOLOGY Vol. 49, No. 1, pp. 212-223. Order HIPPURITOIDA Newell, 1965 Superfamily HIPPURITACEA Gray, 1848 Family CAPRINIDAE d'Orbigny, 1850 Genus CORALLIOCHAMA White, 1885 CORALLIOCHAMA ORCUTTI White, 1885 " Seven species have been placed in Coralliochama. Muellerried (1932) reviewed the six species known to that time and concluded that only three of them were correctly included in Coralliochama: C. orcutti White, 1885, C. gboehmi Bose, 1906, and C. n. sp. Muellerried, 1931. The latter two species are known only from eastern Mexico. An additional species, C. flouriei Damestoy, 1965, was described from Punta Banda. Coralliochama flouriei is known from a single specimen given to Damestoy by G. Flourie, who visited Punta Banda, and it is obviously an extensively eroded young adult of C. orcutti and thus a junior synonym. Damestoy's specimen is characterized by an abruptly truncated apex on the conical attached valve, and by details of its dentition as seen in a cross-section made approximately along the plane of commissure. However, truncation of the attached valve illustrated by Damestoy appears to be due to breakage rather than to natural growth, as is often the case with specimens of C. orcutti. The dentition shown by Damestoy does not differ from that described here for C. orcutti. " - as stated in the mentioned reference "Coralliochama orcutti is the only rudist bivalve known at Punta Banda. Although this species is said to occur throughout several hundred feet of strata (Anderson and Hanna, 1935), it is found most abundantly in one bed 1.5 to 2 meters thick, in which the rudist shells form the bulk of the deposit. " Specimens of Coralliochama orcutti collected at Punta Banda, Mexico. All specimens from LACM locality 2505 unless stated otherwise. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
PRK Posted December 30, 2016 Author Share Posted December 30, 2016 Yup, coraliachama. I couldn't remember how to spell it Link to comment Share on other sites More sharing options...
abyssunder Posted December 31, 2016 Share Posted December 31, 2016 What you have is a really nice specimen. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
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