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Showing results for tags 'holdfast'.
Found 12 results
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A rangeomorph holdfast trace fossil from the Ediacara formation, Rawnsley quartzite of the Flinders Range, South Australia. This specimen is Medusina mawsoni, so called because it was until recently thought to be a jellyfish, but is now believed to be the attachment point of a fractal rangeomorph as Charniodiscus is the point of anchorage for Charnia sp. This one may have been the holdfast point for some species of Rangea. The diameter of the outer circle is 1.5 cm and the fossil is estimated to be 555 million years old.
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- paradoxides series
- slammestadt
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Hello, I believe this to be a "holdfast" from the Crawfordsville Indiana crinoid locality. I am hoping that someone could help with identification of the particular species, and also if there is a scientific name for "holdfast." Thank you!
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I enjoyed an autumn drive through the rusty-red-colored oak forests that blanket the scenic mountains of northeast West Virginia. Two inactive quarries enticed me to prospect a bit. In the first quarry of Ordovician age shaly limestone was this graptolites plate .... perhaps Climacograptus? In the second quarry of early Devonian age massive limestone was this crinoid column base with the attached holdfast. Both specimen photos are as found.
- 2 replies
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- 10
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- graptolite
- devonian
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Have you ever wondered what the holdfast root system looked like? I did. So I prepped one of my least costly duplicates to see the whole picture. Here are the before photos.
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I can't seem to find an ID for this find. I believe this may be a siphuncle. What do you guys think? The "V" shaped sutures are really throwing me off. Has anyone seen a straight shelled cephalopod with this "V" pattern? Kinda neat how you can see how this was buried, preserving one side as it weathered the other. Then along came a dozen crinoids or so a used it as a nice base.
- 7 replies
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- ordovician
- cephalopod
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The symmetry in this little feature really is amazing to me. Its about 8mm dia. I'll go out on the limb and guess that it is the mold of a small crinoid holdfast. (its a very slender, shaky limb though) Do you recognize it ? Thanks again
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Found this piece in Iowa yesterday while hunting trilobites. I've never seen anything like it. The six point symmetry with it's bulbous tips are very strange. And the fact that it is very water-worn doesn't help with an ID. I'm thinking holdfast or possibe starfish. What do you guys see? Scale in mm/cm
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From the album: Other Fossils
Another holdfast from the Maquoketa formation. -
From the album: Other Fossils
This is a crinoid holdfast attached to a cephalopod. There are a couple more smaller ones to the upper right of the large one. -
From the album: Other Fossils
These are multiple crinoid holdfasts on what was once a cephalopod. -
From the album: Other Fossils
This is a crinoid holdfast from the Prosser member of the Galena formation of Southeast Minnesota. -
From the album: Other Fossils
This is a crinoid holdfast from the Galena Group of Southeast Minnesota.
