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Shells fossils
Shells fossils  
I found shells fossils in a beach. I donīt know the name,  1 and 5 are complete both sizes with soil inside. I read in a page that the number 5 is a superb pectin and have about 18 millon year, but I dont know if it is correct ante the name of the others. the 2,3 and 4 maybe are the same but eroted by sand and sea. Let me know if you have information about that. Many thanks in advance and regards.
If you are interested in buy that let me know.
Dario lobos

Answer
Dario:

No.1 is a pectin, it has the typical flattened rear hinge.  The others look to be brachiopods.  Brachiopods were once the most common shelled creature found in the ocean, with over 12000 species recognized.  They date from the Cambrian to modern times with the 2/3rds of the species dying off in the Permian-Triassic extinction event.

No. 5 appears to be a Rhynchonellid brach.

No. 2, 3, and 4 are mre difficult from the picture to identify.  I have seen some smaller specimens similar to 3 and 4 and they are brachs as well.



Here is a good source if you are continuing to collect fossils in that area:

http://www.pdv.com/lexico/excursio/exc-n74.htm

http://www.amazon.com/Stratigraphy-Fauna-Agua-Salada-Group/dp/1258337746

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Keith Patton

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I can answer questions concerning physical and historical geology, environmental geology/hydrology, environmental consulting, remote sensing/aerial photo interpretation, G&G computer applications, petroleum exploration, drilling, geochemistry, geochemical and microbiological prospecting, 3D reservoir modeling, computer mapping and drilling.I am not a geophysicist.

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I have 24 years experience split between the petroleum and environmental industries. I have served as an expert witness in remote sensing, developmental geologist, exploration geologist, enviromental project manager, and subject matter expert in geology and geophysical software development.

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American Association of Photogrammetrists and Remote Sensing

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Registered Geologist in State of Texas

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