Dawsonoceras is another cephalopod that swam the waters of Sillurian Gotland. They are an orthoceratid straight-shelled nautilid that floated in a vertical position on the water collumn.
Although they are far smaller than some of the other orthocones and endoceratids that reached lengths of up to 5 meters, their shell is just as beautiful to behold.
Kröger, B. (2013). The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden. European Journal of Taxonomy, (41).
Above specimens A,B, & E are dawsonoceratids, Scale bars: 10 mm.
From what I can gather, their adult shell diameter reaches 2.5 cm wide and it's hard to guess the total length because a lot of the shells are fragmentary. There seems to be one complete specimen online that was described to be 7.1" inches long
And another here that's 40 cm long, although it's an ID-guess from the blog poster
Flynn likes to be involved with everything I do. If he sees me crouch down to look at something &/or pick it up, he likes to come & inspect it as well. In case it's interesting. Or edible. Or both.
In this case, I'd found a fossil. According to Flynn this falls in the "Not Interesting" category but he gave it a polite sniff all the same. Like I politely praise him when he finds & shows me puddles & molehills. We humour each other.
Such a teeny tiny fossil! It's one of the smallest I've found. Probably at least 420 million years old, which is just completely wild.
Felt like challenging myself and drew my sona as one species of my choice from each period of the Phanerozoic. And now I challenge all of you! Draw your own Prehistoric Challenge and tag it #PrehistoricChallenge. I'd love to see what you come up with. 🦖
Here's my sona from the Cambrian to the Paleogene (Tumblr won't let me upload the rest so look for my second post for the last 2).
Some details from a mural I did along the side of my bed. Going for the vibe of those old science museum pieces where they scroll through all the different eras of earth history...
An unfortunate biological scheduling conflict occurs on the coast of a Silurian lagoon when Pseudoniscus horseshoe crabs and Eurypterus sea scorpions come to the same beach to mate and spawn. Although they are relatives who share both this behaviour and eyes which lack acuity, but have perfect night vision, the sea scorpions have no qualms about using this accidental meeting to snack on their smaller cousins.
I've been trying to create a Spider-sona for myself and since one of my greatest obsession is the paleontology, I thought that a peleontology themed spider was the best.
The problem? I had three very different ideas:
Paleo-spider: A paleontologist bitten by a prehistoric arachnid, not absolutely sure if during an excavation or in a lab Jurassic world stile. (The more similar to me)
Spider-gorgonops: A Inostrancevia, a permian (favorite period) creature, front the group of the gorgonopsid, bitten by a radioactive arachnid. (Peter Permian is simply too cute)
Spider-silurian: a Silurian (prehistoric reptile people from Dr Who, Earth-5556) bitten by a radioactive arachnid. (Combines Dr Who, Spider-man and Paleontology)
I love the three designs the same amount and at the same time I don't feel completely satisfied with any of them.
For now I show you the first tough designs of the three and I will see what ends up coming out of this.
Researching the environment the Oncocerids lived in, some of the silurian reefs in Gotland, Sweden were primarily comprised of Stromatoporoid sponges.
These were sponges that grew in layers encrusting on rocks, sediments, each other. Creating a reef over time
The ones depicted here are new budding reefs, relatively empty, growing atop a sediment of crinoid fragments
Older reefs would have shared their space with tangles of camerate crinoids, which at the time were abundant and were found to be the most numerous at the reef flanks
(something I will get to modelling after this and I dread it)
part 2 to this post! had another school project but this time i turned it in on time :> also updated trilobite and opabinia, i thought the first trilobite looked kinda boring and i took huge inspiration from this reconstruction guide from twitter!!!
These tiny geometries were nomadic cities, floating where the currents took them, so that their citizens might cull an entire sea, sweeping particles from the brine, leaving behind empty water, like rakes gathering mowed grass across a freshly cut lawn.