Paleonet: Help with some fossils

[Jinzhuang Xue]

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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