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Showing results for tags 'columnals'.
Found 5 results
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I know how Crinoid columnals looks like, but which are the features of other echinoderm classes (Rhombifera, Diploporita,...)? Image of a crinoid columnal mould (scale bar 5mm).
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Crinoid columnals from Devonian Keyser Formation in Pennsylvania
traveltip1 posted a topic in Fossil Hunting Trips
I collected some crinoid columnals and a horn coral....weathered from the Devonian Keyser Formation limestone in Pennsylvania. As usual, preservation is not very good. -
Hello, I have many crinoid columnals that I collected in gravel (I suppose it was river/creek gravel collected and sold by a "sand and gravel" company) in Illinois many years ago. I have two questions that may be obvious to more seasoned fossil hunters/students. 1) Exactly how did the crinoids actually grow, meaning, how did the stems' diameter expand horizontally in size as time went on, since the stems were mostly composed of hard calcium carbonate/lime. In other words, it seems that once they are "hardened" or "frozen" into a certain size, how can they get bigger? Was the
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These columnals can be quite common. Some are smooth, some warty.
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- north carolina
- columnals
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The last time I was on a fieldtrip to Brownwood, Texas, I collected a lot of the abundant crinoid stem sections that seemed to laying all over the ground wherever we stopped. I tried to collect as many of the solitary segments as possible but they were far less abundant than the column sections. Years ago, someone was telling me that there were sites where the solitary columnals could be collected by the handful. I am hoping that someone on the Forum can steer me towards information about potential sites like that. Now that I am retired, I have become a Docent at the Houston Museum of
