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Hi: I'm not sure if these will be of any help to you at all, but here goes... In South Dakota (Black Hills area) the contact between the Carlile Fm and the overlying Niobrar Fm is marked by a phosphate concentrate horizon. An old reference book I have listed an occurrence of Allocrioceras sp. in the ammonite fauna from that horizon. I'm not sure if that could represent A. hazzardi or not. Here is the book title: "Geology of the Black Hills, South Dakota, and Wyoming, 2nd edition". Fredrick J. Rich, Editor. Field Trip Guidebooks Geological Society of America, Rocky Mountain Section, 1981 Annual Meeting, Rapid City, South Dakota. The reference to Allocrioceras is on page 14 of the first article in the book, "Stratigraphy and Depositional Environments of Lower and Upper Cretaceous Strata, Southern Black Hills, South Dakota." by Richard Bretz, Gale Bishop, James Fox, and Kunar Dandavati. The other suggestion I have is that you might try contacting the Black Hills Museum of Natural History: http://www.bhmnh.org/component/option,com_frontpage/Itemid,1/ You can send them a question via e-mail under the "contact us" header. I have sent them some questions before and have generally gotten some helpful responses. The Larson brothers run the Museum and related gift shop, and have collected extensively in the Cretaceous of the Black Hills area. Mostly they do work on Pierre Shale/Fox Hills Fm ammonites, but I would guess they must have some specimens from the Carlile/Niobrara contact horizon. I'm not sure if they are currently working on them or not, but it is worth a shot. If you can send along any digital photos, that may help. I hope you have some luck with your search. I realize these contacts likely cannot help you much, but if there is even a small chance, it's worth a try. Good luck! -Jim Preslicka On Feb 27, 2006, at 12:55 PM, Dee Ann Cooper wrote: > anybody out there working on Allocrioceras or related > genus? > > Dee Ann Cooper, BS, MS, PG > Phone: (409) 751-6907 > Address: 17890 Nonie Lane, Lumberton, TX 77657 >
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