Fossils From Miocene Deposits Near Iquitos Peru Amazon River

[Collosoma]

This is what seems to me to be a rasping mouthpart of some sort most likely armored catfish?,

Edited November 28, 2012 by Collosoma

[Auspex]

It is part of a 'bar' from the crushing dentition of a ray (the raspy part is the root). They are arranged in rows in the mouth of the ray.

[FossilDAWG]

Actually, it is a tooth of a myliobatid ray, likely a Myliobatis or Aetobatis. Check out Elasmo.com for info and images.

Don

[Collosoma]

This is great! I have plenty more to come. Can I just post more photos by editing this one or should I make a new post completely

This was found exposed on a fast flowing riverbed in higher grounds, the marbling I believe is calcite although it has a yellowish tint to it when polished

Edited November 28, 2012 by Collosoma

[Auspex]

...This was found exposed on a fast flowing riverbed in higher grounds, the marbling I believe is calcite although it has a yellowish tint to it when polished

Do I see correctly that this is 28 cm (about 11") long? My first thought was that it could be a coprolite, but is is very large...

I do not know what it is.

[Collosoma]

I have been told that it looks like a coprolite, that is the correct length . There was a lot of megafauna in this area

[Collosoma]

Tooth or seed?

[Auspex]

Tooth or seed?

Is the age and environment of the deposit known?

[Collosoma]

As you may know the amazon basin deposits are a conglomerate of mixed eras due to the avulsive nature of its history, this was found with the above " coprolite" in a stream channel that is half way cut through the pevas formation. It is hard to say wether it was redeposited or it existed during the time of formation 22.5Ma-23.9Ma

Edited November 28, 2012 by Collosoma

[cowsharks]

The large specimen with the tapered "pinched" end also reminds me of a coprolite. As for the tooth/seed item, hard to see the surface, but it does look similar to the small croc teeth that I have - just the caps minus the root. Better pics of the surface might help.

Daryl.

[Auspex]

...As for the tooth/seed item, hard to see the surface, but it does look similar to the small croc teeth that I have - just the caps minus the root...

Good eye; this seems a strong possibility.

[Collosoma]

This caiman tooth was found together with the rootless one in question and the ray dentition. Sorry about the blurryness of the second image

[Collosoma]

Here are two coprolites

[Collosoma]

The same rib with two perspectives, I could not begin to speculate to what it belongs

[Collosoma]

Another rib, possibly a boa constrictor

[Collosoma]

Same vertebrae two perspectives possibly crocodillian

[Collosoma]

operculum and skin armor plate of phractocephalus red-tail catfish