ttantalo Posted July 27, 2015 Share Posted July 27, 2015 Found today on Lake Ontario Shoreline. Link to comment Share on other sites More sharing options...
Rockwood Posted July 27, 2015 Share Posted July 27, 2015 Horn coral. Cross section on the right in the first photo. A more oblique section in the second. Link to comment Share on other sites More sharing options...
FossilDAWG Posted July 27, 2015 Share Posted July 27, 2015 (edited) The fossils are rugosan corals. Such fossils are common in certain rock formations exposed at places along the Lake Erie shore. For example if you visit Rock Point Provincial Park you will see an excellent example of a Devonian coral reef in the Onondaga Formation rocks exposed there. Also such fossils can be found in rocks from glacial deposits, which were scraped from the bedrock surface and transported (generally from North to South) across considerable distances. If you found this at the Lake Ontario shore it was transported (likely by a glacier) as there are no outcrops of Devonian age on that shore (only Ordovician), and the internal structure of the corals suggests they are Silurian or Devonian but not Ordovician. Don Edited July 27, 2015 by FossilDAWG 1 Link to comment Share on other sites More sharing options...
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