Paleonet: Help with some fossils

[Roy Plotnick]

i was thinking the same thing - Roy
On Jun 23, 2014, at 10:47 PM, friedmanhvj at yahoo.com wrote:

> 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
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