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Cretoxyrhina (para)symphyseal teeth

Sun, 12 Apr 2026 20:08:10 +0000

A couple of rare file teeth from Cretoxyrhina. Later lamniformes (e.g. Lamnidae) lost these tooth positions so their teeth could get larger.

Britton fm. (Cenomanian), Texas

Fish vertebra detail

Sun, 12 Apr 2026 20:08:07 +0000

Fine detail in a bony fish vertebra, showing the exquisite level of preservation in the Britton formation.

Firsts

Sun, 12 Apr 2026 19:59:56 +0000

The Albian was an interesting time for sharks, being a period of rapid diversification. It's here where we see the earliest members of lineages that would come to dominate the Western Interior Seaway. In that sense, I like to imagine the Albian as the "rehearsal" of what was to come for that famous and burgeoning shallow sea in North America.

In my palm are the among the earliest known representatives of Cretoxyrhina, Squalicorax, Cretalamna, and the ptychodontids (Paraptychodus). All are from the Duck Creek and Pawpaw formations in Texas and are over 100 million years old.

Foraminifera Ammodisciata Austin Chalk Formation

Thu, 09 Apr 2026 23:28:51 +0000

Foraminifera Orbitolina texana Glen Rose Formation

Thu, 09 Apr 2026 23:28:05 +0000

Coral Micrabacia sp. Austin Chalk Formation

Thu, 09 Apr 2026 23:26:06 +0000

Worm Pyrgopolon squamosus Austin Chalk Formation

Thu, 09 Apr 2026 23:24:00 +0000

Cretoxyrhina vraconensis

Thu, 26 Feb 2026 02:05:05 +0000

The earliest known form of Cretoxyrhina. They closely resemble Cretalamna, with prominent cusplets in lateral positions.

This particular tooth is potentially from the famous "Motorola Site" that has been built over since the 1990's.

Albian Squalicorax

Sun, 08 Feb 2026 21:34:54 +0000

Among the earliest known appearances of this genus in the fossil record. It has early indications of serrations and the distal shoulder is almost pointed into a cusp? Very cool tooth.

Paraptychodus washitaensis

Sat, 24 Jan 2026 23:26:54 +0000

The earliest-known ptychodontid, and likely ancestor to Ptychodus.