LK Heteromorph Ammonite Idiohamites
Idiohamites fremonti
Duck Creek Fm. (Lower Cretaceous Albian)
Pecos County, Texas
Duck Creek Fm. (Lower Cretaceous Albian)
Pecos County, Texas
The specimen seen here is an exceptional example of a rare heteromorph ammonite from the Duck Creek Formation of Pecos County. This genus is usually found as straight or hooked "candy cane" fragments 50-120 mm long. The circular to oval whorl section usually has a diameter of about 20 mm. Ribs are perpendicular or slightly oblique, ventrally prominent and obscure over the dorsal border. A tubercle is found on each side of the ventral margin of every second to forth rib. Occasionally tubercles are found below the mid-lateral position. They are almost never found with shell or suture pattern. A fragment of another ammonite (Craiginites?) is also in the matrix.