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Showing results for tags 'thelodont'.
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I have read in multiple papers that there are three theories to the preservation of thelodont scales. First, a rapid burial when the thelodonts have died under still circumstances, e. g., in a lagoon or other still body of water. This results in associated scales. Second, the thelodonts die and disintegrate in the open ocean, leaving behind disassociated scales. Third, the thelodonts were eaten, and deposited as coprolites. Now, I have just found an array of thelodont scales in a single small spot. The stone they are preserved in is a lighter color than the rest of the shale. The
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From the album: Harding Sandstone
Possible early shark or shark-like denticles. Magnification 40x. -
From the album: Harding Sandstone
Possible early shark or shark-like denticles. Magnification 40x + iPhone zoom. -
Originally described as Thelodus scoticus Traquair, 1898. Taxonomy from Märss & Ritchie 1997. Revised diagnosis from Märss & Ritchie 1997, p. 150: "Scales medium-sized (up to 0-6 mm long), made up of crown, neck and base. Rostral scales not distinct. Crowns of cephalo-pectoral scales are rounded to rhomboidal with notches around the crown margin or only anteriorly; postpectoral and precaudal scales rhomboidal becoming more elongated posteriorly, median crown plate flat, smooth or with a notch anteriorly which becomes a furrow on the posteriorly situated scales. Beneath the median p
