Jump to content
  • Cookiecutter Shark Tooth (Posterior)




    Cookiecutter Shark

    Kingdom: Animalia
    Phylum: Chordata
    Class: Chondrichthyes
    Order: Squaliformes
    Family: Dalatiidae
    Genus: Isistius
    Species: Isistius triangulus
    Author Citation T.N. Gill, 1865

    Geological Time Scale

    Eon: Phanerozoic
    Era: Cenozoic
    Period: Neogene
    Epoch: Pliocene


    Tamiami Formation


    Date Collected: 07/23/2017
    Acquired by: Field Collection


    Width: 4.0 mm
    Height: 3.5 mm
    Thickness: 0.5 mm


    "Cookiecutter Creek"
    Sarasota County
    United States


    This tooth is a lower from the final tooth position (most posterior) on the left side as indicated by the bulge on one side of the tooth and lack of overlapping facet. The lingual face of the tooth is shown in the photo as indicated by the distinct delineation of the crown enamel and the root (less distinct on the labial surface). Teeth in a more anterior position have overlapping facets on both edges (with the symphyseal having both facets on the lingual face).


    The stratigraphic information for this locality is questionable and so is specified vaguely. The environment is marine shell hash that may span late Miocene-Pleistocene. Dr. Richard C. Hulbert, Jr. from FLMNH had this to say about the locality:


    There are two “formations” found near the surface in that area of the state.  One is the middle to late Miocene Peace River Formation.  The other “formation” possible is has been informally called the Okeechobee Formation by Tom Scott, and consists of the sandy shell beds formerly called the Caloosahatchee, Bermont, and Fort Thompson formations.  On the geologic map of Florida published by the state’s geological survey it is not designated a formal name and is instead listed as Pliocene/Pleistocene shelly unit.  Even if found in situ within the Plio/Pleistocene unit, such specimens could be reworked out of the Peace River Formation.  If you are finding them in modern creek alluvium, it will be difficult to be sure which is their original depositional unit.

    User Feedback

    There are no comments to display.

    Join the conversation

    You can post now and register later. If you have an account, sign in now to post with your account.

    Add a comment...

    ×   Pasted as rich text.   Paste as plain text instead

      Only 75 emoji are allowed.

    ×   Your link has been automatically embedded.   Display as a link instead

    ×   Your previous content has been restored.   Clear editor

    ×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...