Aaaaaand done! I finally took a step out of my digital comfort zone and beat an art challenge with normal pens! (Somewhat, the shading was added digitally, I'm a coward)
This floating alien egg is Octameroceras, they're part of a group of cephalopods called Oncocerids which diverged earlier than the nautiloids and ammonites.
As they reach maturity, their shell opening, the aperture closes in on their face creating these Giger-esque shapes, and we can only speculate what bizarre mangled forms the creature peeping through that opening would have.
[image credit: Stridsberg, S. 1 985 05 09: Silurian oncocerid cephalopods from Gotland. Fossils and Strata, N o. 1 8, pp. 1-65. Oslo ISSN 0300- 9491. ISBN 82- 00- 07575-3.]
A small 2 cm #ammonite from the #Jurassic of #Morocco with a nice internal cross section. Also an improved version of the ammonite from yorkshire I photographed the other day.
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