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Showing results for tags 'archaeocyathid'.
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This is a piece that I picked up on a geology field trip years ago in eastern New Mexico. I apologize that I have unfortunately lost the field notebook that contains more specific location information, but I am hoping to get in contact with the teacher that took us there for other reasons and might be able to provide additional information if I can ask him. The section was Cambrian to Ordovician in age: it started with abundant stromatolites, then progressed into thrombolites and finally siliciclastics disappeared during the Ordovician sea level high-stand. This piece was found from amidst microbialites, so should be Cambrian in age. My professor identified it as a "sponge" at the time. I am wondering if it is perhaps an archaeocyathid based on the age and the central hole. Either way, if anyone that is more familiar with that area has thoughts on any more specific identification, I would be thrilled! Please ask if you need photos from a different angle or anything like that. Thank you very much!
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.
About 515 million years old, this archaeocyathid shows excellent specimens with both lateral and vertical sections. The internal septa separating the internal wall from the external wall can clearly be seen and the central cavity. Archaeocyatha
Hello. I went on a long hike a few days ago and stumbled upon this in a large Cambrian rock. I believe most of the outcrops in this area are very early Cambrian as I find a lot of Archaeocyathids. Is this structure somehow related to the Archaeocyathids? It's about 6 inches in diameter. I have an average sized hand. Another fossil I'm trying to figure out is this.... Sorry the pic is a bit dark. I'm thinking maybe it's a priapulid with the bottom section broken off? The probiscus appears retracted on the upper right hand side, and the segmentation of the organism is clear. Thanks. Hat.