Conodont BM1A05

Conodont BM1A05
Sb element of Phragmodus undatus
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-- BM1A05X01
-- BM1A05S02
-- BM1A05S03
BM1A05M04 -- BM1A05M05. -- BM1A05M05 -- BM1A05M06

Estimated Age: about 450 million years old.
Comments: Scale Bar is 0.5 mm. Recovered from hard rock using acetic acid and sodium metatungstate. Dayton Area, Ordovician Silurian Boundary -- teaching materials courtesy of Jeff Bauer. Sb element of Phragmodus undatus. Lateral costae assymetrically disposed; cusp and element twisted. Photo BM1A05M04 was taken with the big microscope, and shows the cross-section shape of the cusp and costae. The oral costa actually corresponds to point A, and the aboral costa to point B. The same picture was taken again as a mosaic for BM1A05M05, and rotated downward for BM1A05M06 to show the cross section of the large denticle.

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