1990) The geology of Hurdygurdy Basin is a Jurassic ophiolite series of metamorphosed sedimentary and volcanic rock Most bedrock has been strongly folded and sheared and the significant variation in erodibility of formations has led to a melange of stable and unstable 3
saurus represents the ?rst known reptile with ontogenetic edentulism and is the only known example of ontogenetic edentulism in the fossil record of jawed vertebrates Otherwise, ontogenetic edentulism is known only in a few extant species ofteleost?sh[12,13]andtheplatypus[14] Comparatively,onto-
A GIANT SKULL, ONTOGENETIC VARIATION AND TAXONOMIC VALIDITY OF THE LATE TRIASSIC PHYTOSAUR PARASUCHUS SPENCER G LUCAS 1, ANDREW B HECKERT 2 1AND LARRY RINEHART 1 New Mexico Museum of Natural History, 1801 Mountain Road N W , Albuquerque, NM 87104; 2 Department of Geology, Appalachian State University, ASU Box 32067, Boone, NC 28608-2067