Paleonet: Help with some fossils

[friedmanhvj at yahoo.com]

To me they don't seem biological in origin, they look  like cone in cone structures.

Virginia Friedman 


On Monday, June 23, 2014 3:49 PM, Roger D. K. Thomas <roger.thomas at fandm.edu> wrote:
 


Dear
Jinzhuang,    

     Cephalopods are often
current-aligned, as in the case of Mississippian examples in the Grand Canyon that
have been interpreted by Creationists as evidence of the Great Flood (!!).  Ordovician orthoconic cephalopods were long
ago studied and interpreted more conventionally by Richard Reyment as being oriented horizontally
and vertically by marine currents.    
     However, the crossbars on your specimens show
no indication of being relatively widely and regularly spaced, like cephalopod
chambers.  Also, some specimens appear to
be slightly bent, although this could be a result of asymmetric compression or
structural deformation.  The photograph
appears to show a bedding plane surface. 
Is this correct?  

     Conulariids, by
any chance?  

     Kind regards,   Roger    




On Thu, Jun 12, 2014 at 2:37 AM, Jinzhuang Xue <pkuxue at pku.edu.cn> wrote:

Dear all,
>     The attached is a picture showing some conical things horizontally laying on the bedding plane of sandstones. They look like stromatolite but they are not.  But, are they trace fossils? sedimentary structures? or anything else?  We are wondering if anyone here could help us for identifying them.  Has anyone found similar things before?  Thanks a lot in advance.  The age of the rock is Late Devonian Famennian, and the depositional environments may be swamps near coastal area.
>
>All the best,
>
>Jinzhuang Xue
>Peking University
>　　　　　　　　pkuxue at pku.edu.cn
>　　　　　　　　　　2014-06-12
>
>
>
>
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-- 

Roger D. K. Thomas
>John Williamson Nevin Professor of Geosciences 
>Secretary-General, International Palaeontological Association
>___________________________________
>Department of Earth and Environment
>Franklin & Marshall College
>P.O. Box 3003
>Lancaster
>Pennsylvania 17604-3003
>______________________________
>Office telephone:  717-291-4135
>Office fax:    717-291-4186
>Home telephone:   717-560-0486
>http://www.fandm.edu/rthomas

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