UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director For sale by <strong>the</strong> Superintendent <strong>of</strong> Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price 50 cents (paper cover)
Abstract __________________________________________ _ Introduction ______________________________________ _ <strong>Early</strong> work on <strong>the</strong> <strong>Cutler</strong> <strong>Formation</strong> _____________ _ Present study _________________________________ _ Acknowledgments ______________________________ _ Geography ________________________________________ _ Location and extent <strong>of</strong> area _____________________ _ Surface features and areas <strong>of</strong> outcrop _____________ _ Geology __________________________________________ _ Stratigraphy and structure <strong>of</strong> <strong>the</strong> Placerville area __ _ <strong>Cutler</strong> <strong>Formation</strong> <strong>of</strong> Colorado ___________________ _ <strong>Cutler</strong> <strong>Formation</strong> <strong>of</strong> nearby States _______________ _ Vertebrate fauna ___________________________________ _ Systematic descriptions _________________________ _ Eryops cf. E. grand is (Marsh, 1878) __________ _ Platyhystrix rugosus (Case, 1910) ____________ _ New (but unnamed) genus and species _______ _ Diadectes sanmiguelensis Lewis and Vaughn, n. SP-------------------------------------- Limnoscelops longijemur Lewis and Vaughn, n. gen., n. sp ______________________________ _ CONTENTS Page C1 1 1 1 2 2 2 2 2 2 3 5 5 7 7 8 12 13 21 ILLUSTRATIONS Vertebrate fauna-Continued Systematic d escri ptions-Contin ued Ophiacodon sp ___________ - ___ - __ - - _ - - - _ - - - -- <strong>Cutler</strong>ia wilmarthi Lewis and Vaughn, n. gen., n. SP------------------------------------ Mycterosaurus smithae Lewis and Vaughn, n. sp_ Age and correlation <strong>of</strong> <strong>the</strong> fauna----------------- 7 --- Comparison with <strong>Early</strong> <strong>Permian</strong> faunas <strong>of</strong> North America ____________________________________ _ Comparison with European <strong>Early</strong> <strong>Permian</strong> faunas __ Paleogeographic considerations ______________________ _ Selected references ____ ---- _________ ---_------------- Footprints <strong>from</strong> <strong>the</strong> <strong>Cutler</strong> <strong>Formation</strong>, by Donald Baird_ Abstract ______________________________________ _ Systematic descriptions _______________ ----------- Limnopus cutlerensis Baird, n. sp _____________ _ Genus indet., cf. Brachydactylopus Toepelman and Rodeck, 1936 ________________________ _ Prospectus and problems _________ - __ ------------ References cited _________________ - ___ -_--------- FIGURE 1. Index map <strong>of</strong> Colorado __________________________________________________________________________ -_ Page C3 2. Diagrammatic section showing geologic formations <strong>of</strong> <strong>the</strong> Placerville area ___________________ ------------- 4 3. Pr<strong>of</strong>ile and section, <strong>Cutler</strong> <strong>Formation</strong>, Placerville area_________________________________________________ 6 4. Fossil vertebrate locality map, Placerville area________________________________________________________ 5-6. Photographs: 9 5. Platyhistrix rugosus, natural mould__________________________________________________________ 10 6. Platyhistrix rugosus, latex cast______________________________________________________________ 7-13. Drawings: 11 7. Diadectes sanmiguelensis, n. sp., type skull____________________________________________________ 15 8. Diadectes sanmiguelensis, n. sp., type lower jaw and lower left front leg ______________ -_-_--------- 16 9. Limnoscelopslongifemur, n. gen., n. sp., elements <strong>of</strong> type and referred specimen____________________ 22 10. Ophiacodon sp., vertebrae___________________________________________________________________ 27 11. <strong>Cutler</strong>ia wilmarthi, n. gen., n. sp., type_______________________________________________________ 28 12. <strong>Cutler</strong>ia wilmarthi, n. gen., n. sp., type skull and referred snout_ ______________________________ --_ 29 13. Mycterosaurus smithae n. sp., type___________________________________________________________ 35 14. Sketches <strong>of</strong> footprints <strong>of</strong> Limnopus vagus, Limnopus cutlerensis, and korynichniid cf. Brachydactylopus ____ -- _ 48 TABLE TABLE 1. Fossil localities ________________________________________________________ ------------------------------- In Page C26 27 34 39 39 42 43 44 47 47 47 47 47 49 49 Page C7
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