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'bivalvia Cliff ', Mimico Creek


JUAN EMMANUEL

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I made two trips to a place at Mimico creek where a cliff of bedrock collapsed recently and ended up exposing a good amount of fossils. The first trip was on this Wednesday and the other was on today. I mostly found Ordovician bivalves to spice up collection, because my collection lacked pelycopods. The recent rains here in Toronto were the reasons why the bedrock cliff collapsed. And I have to say, the debris that fell was productive!! :wub: I ended nicknaming the spot 'Bivalvia Cliff '. post-13300-0-96096800-1407542722_thumb.jpg post-13300-0-13245500-1407542795_thumb.jpg

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Here are the first batch that came from this Wednesday:

A modiolopsis slab, mostly full of whole complete modiolopsises. There are also a bunch of other critters too, like bryozoans, orthocones, and gastropods etc. Im still wondering if this was a mass death caused by a tropical storm or something else because there are also hashes of isotelus parts present on the slab :blink: and also with the complete specimens of modiolopsis. post-13300-0-73808100-1407542989_thumb.jpg

I originally found it wetpost-13300-0-61098800-1407543067_thumb.jpg

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Here are the modiolopsis. All, if not most, are whole complete specimens. I believe most of them are the species of Modiolopsis concentrica.

post-13300-0-83145200-1407543203_thumb.jpg

This was looks like it was preserved with its mouth openpost-13300-0-65939000-1407543262_thumb.jpg

post-13300-0-86796200-1407543307_thumb.jpg

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More modiolopsis:

post-13300-0-53054000-1407543497_thumb.jpgpost-13300-0-13249600-1407543540_thumb.jpg

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There were also treptoceras crebiseptums. Yay cephalopods!! :D

post-13300-0-70224800-1407543719_thumb.jpgpost-13300-0-78961000-1407543769_thumb.jpg

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And you have other mollusks as. Here is a cyrtolites:post-13300-0-84309800-1407543857_thumb.jpg

And there's this small bryozoan that I had difficulty photographing: post-13300-0-78707500-1407543959_thumb.jpg

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And here you also have isotelus parts scattered throughout the slab. post-13300-0-08135900-1407544170_thumb.jpg

Some have been hashed up! post-13300-0-77981800-1407544111_thumb.jpg

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post-13300-0-63926200-1407544319_thumb.jpg

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That was a good rain :)

"There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant

“Try to learn something about everything and everything about something.” - Thomas Henry Huxley

>Paleontology is an evolving science.

>May your wonders never cease!

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Oh, I almost forgot this one modiolopsis. Its preserved in a diagonal position still burrowed in the matrix.post-13300-0-13207000-1407544404_thumb.jpg

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And I also found what appears to be a another species of modiolopsis. Perhaps modiolopsis ovata? post-13300-0-30382600-1407544786_thumb.jpg This one was a separate specimen from the slab.

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This batch came from today's hunt. Went to the same spot and my find of today would be this whole complete flexicalymene. I was just smashing shale and splitting them all in half mindlessly because I was bored. I was throwing out all the smashed shale debris into the creek's water. All of the sudden when I was just about to throw this shale rock into the water I took a look at it and I saw a complete flexicalymene. post-13300-0-24316800-1407545239_thumb.jpg Glad I noticed it to make a nice save. B) Usually all the flexi's I've found at Mimico creek are incomplete specimens and this is my first complete ( if not my mostly then :P ) specimen. Gotta look at flexi anatomy..... post-13300-0-91709500-1407545877_thumb.jpg

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And I also found other fossils but I still have to yet identify them post-13300-0-09662200-1407545532_thumb.jpg

I wonder what this one is?? It cant be a cephalopod because it's way too flat and doesn't look like a trilobite part. post-13300-0-56736200-1407545660_thumb.jpgpost-13300-0-17410900-1407545726_thumb.jpg

Enjoy everyone!!

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That was a good rain :)

There's gonna be some coming again this Tuesday or so here at Toronto. :o

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Nice finds! Sorry I can't help with your last one, but I'm sure someone in the know should pipe in soon.

Nah, no worries. I wasn't really interested in it, but still I took photos. I'm just curious as to what it could be......

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Your "can"t be a cephalopod" specimen is a cephalopod. When you say "it's too flat", I assume you are influenced by the Treptoceras specimens you have been finding. Treptoceras was an active predator that probably was a fast swimmer, hence the hydrodynamic streamlined round shape to the shell. However other orthoconic nautilods had a pronounced flattened or sometimes triangular cross-section. Often these were larger, heavier forms that probably rested on the sea floor and ambushed their prey . I have specimens of Cameroceras That are markedly flattened on one side from the Georgian Bay Formation in Toronto. I don't see enough features on your specimen to be sure of the identity, but Cameroceras is one possibility.

Nice Flexicalymene! Those are not common to find complete in the Georgian Bay Formation.

Don

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Thanks for the Cameroceras idea, Don. I think I'll go back and retrieve back that specimen to get a closer inspection.

Isn't Cameroceras usually bigger though, like the way how big Endoceras is?

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Cameroceras got to be much bigger than Treptoceras, but it started out small. Anyway I can't say for sure that specimen is a Cameroceras, as I can't see any sign of a siphuncle, so that's just one possibility. Lots of orthocones were flattened on one side, presumably where they rested on the sea floor; for example almost all the actinocerids were like this. My point was that it isn't safe to assume something can't be a cephalopod just because it's "too flat".

Don

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