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WhodamanHD

Blastoid and crinoid mix up

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WhodamanHD

I while back I acquired a collection of fossils,minerals, and rocks. They were apparently found at an estate sale before being bought and sold online, hence the prices on the labels (not what I paid for them). It was rather large and confusing, but I managed to figure a lot of it out. One bag, however, has crinoid and blastoid stems and calyxs (calyxi? Calyxese?) and six labels, none attached to the specimens. I was wonder if y'all could help me sort them out, because I'm confused. A few of the labels are just "crinoid stems", is it possible to get a better ID on them? I can take more pictures if needed. 

IMG_1873.JPG

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Pumpkinhead

My understanding of crinoid vs blastoid fossils is that with crinoids the columnals are generally more durable than the calyx. With blastoids it's the other way around with the calyx being more durable than the bits of stem. Thus most fossilized crinoids you find will generally find pieces of stem and with blastoids calyces unless the conditions under which the fossils were buried were exceptionally calm. With this in mind I would submit to you that the calyces on the top right are most likely blastoids while everything else is crinoidal. Hope this helps

 

Dictionary.com entry for calyx:

 

http://www.dictionary.com/browse/calyx

 

 

Edited by Pumpkinhead
Added more information

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WhodamanHD
2 minutes ago, Pumpkinhead said:

My understanding of crinoid vs blastoid fossils is that with crinoids the columnals are generally more durable than the calyx. With blastoids it's the other way around with the calyx being more durable than the bits of stem. With this in mind I would submit to you that the calyces on the top right are most likely blastoids while everything else is crinoidal. Hope this helps

 

Dictionary.com entry for calyx:

 

http://www.dictionary.com/browse/calyx

 

 

That definitely helps, as well as the plural form of calyx :)

thank you for the information!

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abyssunder

I would label them as follows:

 

IMG_1873.JPG.08724d854db1e009dfc5e4c98fd574ea.thumb.JPG.e579dc3c7de76c154cc1714234bcda70.JPG

 

1 - Star shaped crinoid stem fragments... Pentacrinus/Pentacrinites/Isocrinus...
2 - Dissociated partial crinoid columnal (stem)
3 - Crinoid calyx plates
4 - Blastoid calyces (calyxes)
5 - Crinoid pluricolumnal (stem fragment)
6 - Crinoid pluricolumnals
7 - Crinoid rootlets
8 - Crinoid pluricolumnal

 

I used different terms for the partial stems.

Hope these help.

 

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WhodamanHD
3 minutes ago, abyssunder said:

I would label them as follows:

 

IMG_1873.JPG.08724d854db1e009dfc5e4c98fd574ea.thumb.JPG.e579dc3c7de76c154cc1714234bcda70.JPG

 

1 - Star shaped crinoid stem fragments... Pentacrinus/Pentacrinites/Isocrinus...
2 - Dissociated partial crinoid columnal (stem)
3 - Crinoid calyx plates
4 - Blastoid calyces (calyxes)
5 - Crinoid pluricolumnal (stem fragment)
6 - Crinoid pluricolumnals
7 - Crinoid rootlets
8 - Crinoid pluricolumnal

 

I used different terms for the partial stems.

Hope these help.

 

Thank you, very helpful. I see some labelmaking in my future...

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