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)

Ammonite - "Prize" ...   Youngblood Library fossils   


Location: La Mission, Baja California, Mexico

Geologic Period Range: Late Cretaceous           Traditionally estimated 100 to 60 million years BCE1

Age of Extinct Specimen: Generally estimated about 65 million years BCE1


Description: This "Small Ammonite" is described on the Youngblood Energy Library website as a "prize example".2 This species, Pachydiscus Catarinae ("Thick Disc of Catreina"), is traditionally believed to have become extinct about 65,000,000 years ago B.C.E.1 Although no fossils have been discovered of this actual marine animal, nor of a specimen with an intact fragile outer shell chamber where it lived, it is believed that they may have been similar in function and appearance to today's chambered nautilus found in tropical seas. (The worldwide search by paleontologists for a complete and perfect specimen of this species continues).

Fossils of this species, including this specimen, are found in the Rosario Formation near La Mission in the State of Baja California, Mexico. They are found in boulders (ranging approximately from 4 to 10 foot diameters) made  up of concretionary accumulations of marine matrix originating as giant mud balls that were rolled up, which then adhered to a central rock or fossil, much as a giant snowball rolls up lawn grass and twigs, suggesting great force was applied to create these boulders, probably catastrophic in nature. The Youngblood Library website states, "Unfortunately only 10% of these boulders contain ammonites and a fraction of these contain specimens approaching the quality of this specimen." 2  It is also probable that very few approach the beauty of this "prize" specimen.

1 Estimated by traditional Uniformitarian concepts (gradual, uniform changes over great periods of time, similar to rates of change observed today).

2 For access to the Youngblood Library website it is easiest to copy and paste to your browser:  (Do not just click on link since it then leads back to the slow-loading and difficult to navigate main O. U. Library Systems home page).

NEXT: Fossiliferous Limestone on Page 12  


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


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