Jump to content
Ramon

Fish tail?

Recommended Posts

Ramon

Hi, I went to the Tamazunchale area for Christmas break, and I bought this fossil from a local collector. He told me it was from some sort of aquatic animal. The sediments from the area are from the Pimienta, Santiago, and Taman formations. They represent Late Jurassic marine environments. Could this be a caudal fish fin (fish tail), or something else. I though it resembled part of a feather, but since they are marine sediments I doubt it.

 

2E0E5516-46E8-476B-BF3E-635F36416992.thumb.jpeg.d276ab793ed34cb61fb16a487013a986.jpeg

Share this post


Link to post
Share on other sites
DeepTimeIsotopes

I agree, it looks like a fish tail. Could we get a closer picture of this area to determine if there are any vertebrae present to be certain?

6981E4C0-9D7D-4FDA-907D-C85585603BC4.jpeg

Share this post


Link to post
Share on other sites
Rockwood

I don't think it's a fish tale. or a fish tail.

Share this post


Link to post
Share on other sites
Ramon

I looked up fossil feathers in google, and found this dinosaur feather from the lower Cretaceous of Brazil. 

 

73DFE71D-DAE2-47C8-9420-D12795AD3389.jpeg.3f5dd116ffb047ce1efe9342bc7315af.jpeg

 

D272D88D-8409-4001-927D-3436A28EE5E3.thumb.png.9fb1e198550e8959e5693c6e1181199d.png

 

 

Share this post


Link to post
Share on other sites
Rockwood

Nope.

Share this post


Link to post
Share on other sites
Ramon
1 hour ago, UtahFossilHunter said:

I agree, it looks like a fish tail. Could we get a closer picture of this area to determine if there are any vertebrae present to be certain?

6981E4C0-9D7D-4FDA-907D-C85585603BC4.jpeg

 

Sure, 

 

70213FC1-4C74-4671-9BAD-E12A5E2FBE27.thumb.jpeg.b1a02ca166bc555ebd6fb6870550d3f3.jpeg

 

There seems to be no vertebrae present, or it could be buried under the sediment.

Share this post


Link to post
Share on other sites
DeepTimeIsotopes

There are reports of fossil fish from the Tamán beds. Not much work has been done on these formations, unfortunately.

see the report here: Page 311 in the journal is 

Notes on some Mesozoic fossil fish remains from Mexico

https://www.biodiversitylibrary.org/page/39744993#page/361/mode/1up

Share this post


Link to post
Share on other sites
Ramon
5 minutes ago, UtahFossilHunter said:

There are reports of fossil fish from the Tamán beds. Not much work has been done on these formations, unfortunately.

see the report here: Page 311 in the journal is 

Notes on some Mesozoic fossil fish remains from Mexico

https://www.biodiversitylibrary.org/page/39744993#page/361/mode/1up

 

True, there have been fish remains found in the formations. I personally think my fossil is fish remains, but I am no expert. But I do think it looks unusual. It does quite resemble fossil feathers I have seen on the internet. Let’s see what other members have to say about this fossil.

Share this post


Link to post
Share on other sites
JohnBrewer

@Fossildude19 May be able to shed some light 

Share this post


Link to post
Share on other sites
cck

Looks like a bivalve impression to me- with some parts worn away...

Share this post


Link to post
Share on other sites
Fossildude19

I agree with CCK. 

Looks like a possible bivalve. 

My first impression was that it could be a rostroconch.   :shrug:  :headscratch::unsure: 

 

advanced_rostroconch.jpg

 

 

Image from HERE.

 

However, I'm not sure if they were around in the areas/time period mentioned. 

Share this post


Link to post
Share on other sites
Rockwood
26 minutes ago, Fossildude19 said:

I agree with CCK. 

Looks like a possible bivalve. 

My first impression was that it could be a rostroconch.

I would like to also, but this explanation for the odd symmetry puts the age in contradiction.

Share this post


Link to post
Share on other sites
DeepTimeIsotopes
34 minutes ago, Fossildude19 said:

I agree with CCK. 

Looks like a possible bivalve. 

My first impression was that it could be a rostroconch.   :shrug:  :headscratch::unsure: 

Image from HERE.

 

However, I'm not sure if they were around in the areas/time period mentioned. 

The formations @Ramon listed are Middle Mesozoic so probably not a Rostroconch which have a Cambrian through Permian stratigraphic range for anyone who doesn’t know.

Share this post


Link to post
Share on other sites
Scylla

Something fishy about this fossil:doh!:

Share this post


Link to post
Share on other sites
Ramon

I doubt it’s a bivalve, it’s too symetrical, and too flat to be a bivalve.

Share this post


Link to post
Share on other sites
Rockwood
6 minutes ago, Ramon said:

too flat to be a bivalve

Unless it's a tangential section across the commissure in a situation where only a thin horizon was preserved.

Share this post


Link to post
Share on other sites
KimTexan

It looks like a marine plant to me, but I don’t recall the name.

Share this post


Link to post
Share on other sites
Ramon

Wow, we got people saying it’s a bivalve, others saying it’s fish remains or plant material. This fossil sure is mysterious!! :headscratch:

Share this post


Link to post
Share on other sites
doushantuo

severely weathered Tepexichthys?

(and NOT the tail part,either)

Share this post


Link to post
Share on other sites
DeepTimeIsotopes

Alright, I did some digging and found "An overview of the Mexican fossil fish record" by Katia A. GONZÁLEZ-RODRÍGUEZ, Luis ESPINOSA-ARRUBARRENA and Gerardo GONZÁLEZ-BARBA. They state that the area around Tamazunchale actually has a lot of Paleogene freshwater deposits as well see 27, 28, 29 on their figure 8 with Tamazunchale marked by me. 5c2081cc0a569_ScreenShot2018-12-23at11_21_06PM.png.4281fb6bc967f0c04875e9e0bb588090.png

A quick excerpt from the paper:

"There are some other published records from the upper Pleistocene outcrops of Tlapacoya in the state of Mexico, from where ALVAREZ & MONCAYO (1976) described cranial bones of Notropis aztecus, Algansea ticella, Evarra sp. and various species of Chirostoma. In the state of Puebla, ESPINOSA-PÉREZ et al. (1991) reported the presence of a small cyprinid from the Oligocene Ahuehuetes locality in Tepexi de Rodríguez (Fig. 8: 30). CASTILLO-CERÓN et al. (1996) recovered numerous Miocene otoliths and scales from Zacualtipán, Hidalgo (Fig. 8: 29), and ALVARADO-ORTEGA et al. (2006b) described Ictiobus aguilerai from the Pliocene (Blancan) La Cementera locality near Tula, Hidalgo (Fig. 8: 27), where also Ictalurus sp. remains have been collected. Moreover, BECERRA-MARTÍNEZ (2002) reported Pliocene goodeids from the Atotonilco el Grande Formation in Hidalgo (Fig. 8: 28). As can be seen in this overview, the study of fossil freshwater fishes in Mexico is in its infancy. The challenge is to describe the emerging taxa and to unravel the evolutionary patterns that have been generated in the last 50 million years."

 

Ictiobus aguilerai looks like thisIctiobus_cyprinellus.jpg.59c96a2bc56589b8e4a33544e12c4767.jpg

but Ictalurus sp. was also collected nearby. This genus is a type of channel catfish that have a skeleton that looks like this 5c20800b39790_ScreenShot2018-12-23at11_41_51PM.png.7bb95226960eb10348cd1d59de55abd0.png

They have similar caudal fins to what can be seen in your specimen. 

Share this post


Link to post
Share on other sites
doushantuo

take a peek at Tepexichthys in that very same paper

But I do have to say: I like your investigative endeavours and your inquiring mind:ighappy::dinothumb:

I can't believe i just posted that.

That's costume drama English:D

Share this post


Link to post
Share on other sites
DeepTimeIsotopes
11 minutes ago, doushantuo said:

take a peek at Tepexichthys in that very same paper

But I do have to say: I like your investigative endeavours and your inquiring mind:ighappy::dinothumb:

I like the look of that one.

Knowledge is power!

Share this post


Link to post
Share on other sites
doushantuo

It is.

BTW: the diversity of opinions just go to show how differently morphology can be interpreted 

Share this post


Link to post
Share on other sites
Rockwood
15 minutes ago, Pemphix said:

IMO no fish.

I think ammonite aptychus.

Now we're getting somewhere.

That sounds more like it to me.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Recently Browsing   0 members

    No registered users viewing this page.

×