[NHCOLL-L:4618] RE: Inquiry about a paleo fish

[Carolyn Rissanen]

>From my curator, Douglas Long:

 

There are a number of fossil fish localities that produce concretions, but
my best guess is that this is from the Cretaceous Ceara Formation of Brazil.
This site has produced tens of thousands of nodule-concreted fossil fishes
that have flooded the collector's market since the 1980's (and possibly
earlier).  More recently, there have also been concretions imported from a
late Jurassic site on Madagascar that also have similar lithography.

 

Carolyn Rissanen

Registrar, Natural Sciences

Oakland Museum of California

510-238-3885

www.museumca.org

 

2010 "A New State of Mind"

 

blue-footed booby

  _____  

From: owner-nhcoll-l at lists.yale.edu [mailto:owner-nhcoll-l at lists.yale.edu]
On Behalf Of Bryant, James
Sent: Friday, November 13, 2009 9:29 AM
To: NHCOLL-L at lists.yale.edu
Subject: [NHCOLL-L:4617] Inquiry about a paleo fish

 

A patron brought in the fossil depicted in the attached image. The specimen
is preserved in one half of a limey concretion that is just over 9 inches
long. There are numerous, small calcite crystals thoughout the concretion
and in cavities of the fossil. The remains appear to be of a ray-finned fish
with cycloid scales, but the patron has no information on its source (it was
simply "found in the garage"). In my limited experience, the preservation of
some fish fossils is quite distinctive, so I wondered if anyone would want
to venture a guess as to the origin of this fossil?

<<fish concretion.jpg>> 

James M. Bryant 
Curator of Natural History 
Museum Department, City of Riverside 
3580 Mission Inn Avenue 
Riverside, CA   92501 
(951) 826-5273 
(951) 369-4970 FAX 
jbryant at riversideca.gov 

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