Abstract
The High Bridge Group (Middle Ordovician), and the Lexington Limestone and Clays Ferry Formation (Middle and Upper Ordovician), of central Kentucky contain a diverse fossil invertebrate fauna, including cryptostome ptilodictyoids, the so-called “bifoliates,” as a distinctive element. The ptilodictyoid bryozoans there include nine species of six generaEscharopora, Graptodictya, Phyllodictya, Stictopora, Trigonodictya, and new genusOrectodictyain two families Ptilodictyidae and Rhinidictyidae. Three species are new:Escharopora eparmata, Trigonodictya cirrita, andOrectodictya pansa. Most of the species are closely related to ptilodictyoids occurring in the Middle Ordovician of New York and Minnesota. In Kentucky,Escharopora, Stictopora, andTrigonodictyaoccur in the oldest rocks exposed, and thus include the oldest bryozoans found in Kentucky. The stratigraphic distribution of ptilodictyoids in Kentucky reflects the disconformable contact between the Tyrone Limestone (High Bridge Group) and the overlying Lexington Limestone.
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