the public fossil   collection

Fossil specimens donated by Loyce Youngblood to the

 Laurence Youngblood Energy Library

 University of Oklahoma

Large Ammonite Fossil   (Coahuila, Mexico)

   Large Sabal Palm Frond        (Wyoming)

Energy Library Fossils:

Energy Library Minerals:

Youngblood - Library Story


   Youngblood Library Link     (Oklahoma. University Libraries System)

    Large Ammonite...  Youngblood Energy Library - O.U.

                                                     Donated by Loyce Youngblood

Estimated Age 80 million years Before Common Era (B.C.E.)1

LARGE AMMONITE with NAUTILOID (inside ammonite)

This spectacular Large Ammonite fossil is especially unusual because it also contains a nautiloid specimen inside the well-preserved ammonite.


Location: Northeast of Monclova in the State of Coahuila, Mexico    

Geologic Period Range of Specimens:

Subclass Ammonoidea ("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.  

Subclass Nautiloidea ("nautiloid"): Cambrian to present. this nautiloid (inside the large ammonite) is estimated from 600 million years ago to present.1

Description: Class 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 definitely aged.

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, 3, 4

1 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 observable today).

2 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 Oklahoma University, former O. U. faculty member, currently with the Institute of Creation Research (,.

For more on Ammonites, see: Cephalopods Slab - OU, Page 8.

For more on Ammonites, also see: Ammonite-"Prize" - OU, Page 11.

For more on O.U. fossils, also see: Index and Library Links, Page 15.

For more on fossils dating see Carboniferous Plants Slab - OU, Page 9

NEXT: Sabal Palm - Large, with fish - OU, Page 7.

David Wallace, P.O. Box 23901, Oklahoma City, OK 73123 (405) 974--9759    Copyright © 2009 David Wallace, All Rights Reserved   

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the private fossil collection

Personal fossils from the  residence and estate of  

Loyce Youngblood

Large Sabal Palm Frond overlaying apparent fish  Green River Formation (Wyoming)

 Multiple-Calyx Crinoid   with nine "Sea Lilies"  (Germany)

Single-Calyx Crinoid   "Sea Lily" marine animal    (Purchased from Estate by OU) (Germany)

      Loyce and Laurence:      The Youngblood Story

INDEX - Pages 

For information contact:     David Wallace      (405) 974-9759