_Amebelodon_: shovel-tusked mastodon _Teleoceras_: short-legged rhinoceros _Synthetoceras_: snout-horned even-toed hoofed mammal _Cranioceras_: cranial-horned even-toed hoofed mammal _Merycodus_: extinct pronghorn antelope _Hypolagus_: extinct rabbit _Epigaulus_: burrowing horned rodent _Aphelops_: long-legged rhinoceros _Prosthennops_: extinct peccary _Osteoborus_: short-faced dog _Pseudaelurus_: extinct cat _Hemicyon_: bearlike dog _Procamelus_: llamalike camel _Megatylopus_: giant camel _Pliohippus_: ancestral one-toed horse _Neohipparion_: extinct three-toed horse [Illustration: FIGURE 22.41 Pliocene Mammals. Early Pliocene life of the southern High Plains. (Mural by J. H. Matternes, courtesy U.S. National Museum.)] Due to limited outcrops in the Canyon proper, Pleistocene fossils are very rare. An excellent collection of fossils from Palo Duro Canyon and the Panhandle area is on display at the Panhandle-Plains Historical Museum. [Illustration: Spectacular Palo Duro, “grand canyon” of the Panhandle Plains, is an exciting experience. One of the nation’s most magnificent scenic attractions, it provides delightful drives and opportunities for hiking, horseback riding and camping in season. Visit Palo Duro and enjoy it.] Diamond Shamrock QUALITY ROCK SHOP OVERNIGHT CAMPING LAPIDARY EQUIPMENT QUALITY AGATE & JADE, FOREIGN & DOMESTIC CUSTOM SILVER, GOLD AND TURQUOISE WORK 2 Miles West of Canyon on U.S. Highway 60 Route 1, Box 211, Canyon, Texas 79015 MAGGIE & WHITEY VOELM (806) 655-7631 _Search Drilling Co._ Rotary Drilling Contractors Oil & Gas Producers SUITE 400 WELLINGTON SQUARE OFFICE PARK 1616 S. KENTUCKY AMARILLO, TEXAS 79102 (806) 359-7645 YUCCA PETROLEUM CO. 300 Diamond Shamrock Building P.O. BOX 2585 AMARILLO, TEXAS 79105 Telephone: (806) 376-5431 Argonaut Energy Corporation GLEN S. SODERSTROM, President LORNE E. TJERNAGEL, Exec. Vice-President R. L. PATTERSON, Vice-President of Production 1209 West 7 St. Suite 200 Amarillo, Texas 79101 806/373-6885 W.M. QUACKENBUSH Petroleum Geologist