ARIZONA

COCONINO COUNTY

NORTHEAST SIDE OF THE LITTLE COLORADO RIVER ABOUT 50 MILES NORTH AND A LITTLE EAST OF FLAGSTAFF

2 MILES EAST OF TANNER'S CROSSING

PAINTED DESERT MEMBER

PETRIFIED FOREST FORMATION

EARLY-MIDDLE NORIAN STAGE

LATE TRIASSIC EPOCH

LATE TRIASSIC

STEM: TETRAPODA GOODRICH, 1930

SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: REPTILIA LAURENTI, 1768

SUBCLASS: DIAPSIDA OSBORN, 1904

SUPERLEGION: NEODIAPSIDA BENTON, 1985

LEGION: ARCHOSAUROMORPHA HUENE, 1946

SUPERCOHORT: CRUROTARSI SERENO & ARCUCCI, 1990

COHORT: CROCODYLOTARSI BENTON & CLARK, 1988

SUPERORDER: PARASUCHIMORPHA NOVA

ORDER: PARASUCHIA HUXLEY, 1875

Family: ANGISTORHINIDAE Huene, 1936

Subfamily: RUTIODONTINAE Long & Murry, 1995

*Rutiodon validus
= Machaeroprosopus validus
= Clepsysaurus validus

_____________________________________________________________________________________