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This is another specimen I would like to share from my long-ago collected specimen box. It is my recollection that this was found while walking on exposed riverbed along the north shore of the St. Lawrence River somewhere near Quebec City. The rib-like grooves as seen on the top view are what caught my eye, but after picking up and examining it more closely, the cross-section really got my attention. This spoke "structural design" to me. Although we've certainly all seen unusually shaped rocks that didn't mean anything, this, along with the grooves on the top side, it made me think it wasn't a random rock. I'm guessing this is a fragment of an Ostracoderm, possibly Cephalaspis Lyelli(?). Any other thoughts on what this might be? Thanks in advance for your comments.
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Having recently retired, I'm finally going back to try to catalog some of the specimens I've collected over the years, but have so far not been able to identify. The subject specimen was one collected (to the best of my recollection) back in the 1990's while walking on exposed river bed along the north shore of the St. Lawrence River just south of Quebec City. The specimen is a little over 30 mm long and weighs 30 grams. The distinctive features are the rounded end, flap-like feature folded on the end, and circumferential rings. Below are photos with several views, with the oblique view showing the geometry/features best. I've been thinking this is some kind of cephalopod. Does this look familiar to anyone? Thanks.
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