Northeast of Monclova in the State of Coahuila,
Geologic Period Range of Specimens:
("ammonite"): Ordovician to Cretaceous. These Large Ammonites are
traditionally estimated at 500 to 63 million years B.C.E.1,
but are now extinct. This specimen is believed to be a Parapuzoisia Boesei
of an Early Campanian Age during the Upper Cretaceous Period.
("nautiloid"): Cambrian to present. this nautiloid (inside the large
ammonite) is estimated from 600 million years ago to present.1
Cephalopodia: ammonites and nautiloids are four-gilled cephalopods. The
marine animal lives in the outer-most chamber of an external shell divided
into chambers by transverse plates (septa). Most fossil forms have
well-developed shells, which may be external or internal, and which may be
coiled or curved in various ways. These well-developed marine mollusks are
represented today by the octopus, squid, and pearly nautilus. The subclass
Ammonidea (ammonites) have a thick, strongly ornamented shell that is coiled
in a plane in an asymmetric shape, and has finely divided lobes and saddles
in complex sutures. The ammonites became extinct at the end of the
Cretaceous Period. The subclass Nautiloid is characterized by a siphuncle
near the center, with simple sutures in a coiled, curved or straight
chambered external shell.
An interesting and unique
aspect of this particular large specimen is the joint occurrence of the
nautiloid and ammonite together, with the nautiloid located just inside
the well-preserved ammonite shell, suggesting rapid, turbulent, with
possible synchronous deposition and fossilization, probably by catastrophic,
water-mud burial. Another unusual feature of the specimen is that
nautiloids are not usually associated with Large Ammonites. The specimen was
recovered in the State of Coahuila, Mexico from the San Felipe Formation,
which is equivalent to the upper Austin formation in Texas.
Age of Specimens: Both
specimens are believed to be from the Cretaceous, and estimated at 80
million years Before Common Era by the traditional "Uniformitarian
geologists" (advocating old
age of the earth with long time periods of gradual, uniform change between
epochs, with slow rates of change similar to that observed today).
However, the nautiloid may have been
deposited just inside the ammonite in a more recent period, while the host
ammonite was deposited in an earlier time according to "Neo-Catastrophist"
geologists (advocating an old or middle aged earth with little change
between strata, but punctuated by periods of great catastrophe-related
changes) who might date both fossils as relatively old, but less
Alternatively, "Young Earth
Catastrophist" geologists, armed with startling new evidences, including the
8-year "Radioisotopes and the Age of the Earth (RATE) Research Project might
date all fossils, including this specimen, and the earth itself at less than 100,000 years.2,
Estimated by traditional Uniformitarian concepts (gradual, uniform changes
over great periods of time, with slow rates of change commonly believed to
be similar to those
Thousands…Not Billions: Changing an Icon of Evolution, Questioning
the Age of the Earth by Don DeYoung, Ph.D., Physics Professor,
was a member of the RATE research project team.
3 Footprints in the Ash: The explosive
Story of Mount St. Helens, by John Morris, Ph.D. in
Geological Engineering, University of Oklahoma, and by Steven Austin, Ph.D.
in Geology, Pennsylvania State University.
4 The Young Earth:
The Real History of the Earth – Past, Present, and Future (Revised
and Expanded, 2007) by John Morris, Ph.D. in Geological Engineering from
former O. U. faculty member, currently with the
Institute of Creation Research (www.icr.org),.
For more on Ammonites, see:
Cephalopods Slab - OU, Page 8.
For more on Ammonites, also see:
- OU, Page 11.
For more on O.U. fossils, also
see: Index and Library Links,
For more on fossils dating see
Carboniferous Plants Slab - OU, Page 9
Sabal Palm - Large, with fish - OU,
David Wallace, P.O. Box
23901, Oklahoma City, OK 73123 (405) 974--9759
Copyright © 2009 David Wallace, All Rights Reserved