- Joined
- Jun 8, 2007
- Messages
- 48
cambrian cephs
Update. Yes here they are. Some plectronocerid, cambrian cephalopods.
The one triangular larger one on the right, I believe, is a palaeoceras. The white portion is just over one inch in length. The rock and lichen did interesting effects that made these pop out a bit. The chambers clearly got more filled with calcite, which apparently these lichen don't like (liche?). And these are left uncovered. Other chambers closer to the end and the living chamber filled with the surrounding matrix and got more degraded and colonized. One can see a faint outline of the wall of the living chamber on the palaeoceras.
The one somewhat large sliver of white, with a second sliver of white to the left of the palaeoceras along with the faint outline in the matrix there, I believe is a plectronoceras.
There's a small sort of very small slender fellow below the one on the right, which may be a balkoceras, or one of the not-quite-cephalopods that also happened at the end of the cambrian. Ones with chambers but no siphuncle.
Only cephalopod order left to find is intejocerida. Like Rossoceras Any suggestions?
Update. Yes here they are. Some plectronocerid, cambrian cephalopods.
The one triangular larger one on the right, I believe, is a palaeoceras. The white portion is just over one inch in length. The rock and lichen did interesting effects that made these pop out a bit. The chambers clearly got more filled with calcite, which apparently these lichen don't like (liche?). And these are left uncovered. Other chambers closer to the end and the living chamber filled with the surrounding matrix and got more degraded and colonized. One can see a faint outline of the wall of the living chamber on the palaeoceras.
The one somewhat large sliver of white, with a second sliver of white to the left of the palaeoceras along with the faint outline in the matrix there, I believe is a plectronoceras.
There's a small sort of very small slender fellow below the one on the right, which may be a balkoceras, or one of the not-quite-cephalopods that also happened at the end of the cambrian. Ones with chambers but no siphuncle.
Only cephalopod order left to find is intejocerida. Like Rossoceras Any suggestions?