Blancan Carnivore Trigonictis 
29 
among mustelids. The specimen cannot be assigned to Trigonictis, at 
least until more is known of its postcranial osteology. 
Type locality. — Hagerman (one mi. S of Plesippus quarry), west side 
of Snake River, Twin Falls Co., south-central Idaho (Fig. 1, loc. 3). 
Distribution. — In addition to the type locality (Fig. 1, loc. 3), in the 
Hagerman fauna of early Blancan age, T. cookii is known from the 
Jackass Butte locality, Owyhee County, Idaho (Fig. 1, loc. 2), in the 
Grandview fauna, and from Frick Prospecting Locality 277, Booth 
Draw, Brown County, Nebraska (Fig. 1, loc. 5) in the Sand Draw fauna, 
both of late Blancan age. See Distribution under T. macrodon for addi- 
tional details. 
Haile XVI A, Alachua County, northern Florida (Fig. 1, loc. 10), lies 
near the center of the Haile limestone mining district about 1 km north- 
east of Haile XV A (Robertson 1976) at an elevation of about 26 m. The 
fossil vertebrates occur in a large fissure carved from the late Eocene 
Ocala limestone and filled with massive dark, gray-brown, silty clays. The 
fissure was at least 8 m wide, and possibly of equal depth; unfortunately 
the site was destroyed by mining operations before its dimensions could 
be determined with accuracy. The sediments are high in dark organic 
content and show no signs of oxidation, unlike most fissure-fill sites in 
the Haile district. 
The vertebrate fauna from Haile XVI A is currently under study by 
Michael Frazier who generously permitted us to mention this local fauna. 
Its age is Irvingtonian, probably older than the Coleman II A local fauna 
of late Irvingtonian age (Martin 1974). The aquatic elements of the fauna 
include Rana, urodeles, abundant kinosternid turtles, Deirochelys, 
Chrvsemys, Alligator, and a natricine snake. The diverse terrestrial 
fauna, in which Eremotherium and Crotalus are unusually abundant, 
includes representatives of both mesic and xeric habitats. 
Geologic age. — Blancan Land Mammal Age, with the exception of 
the one record of Irvingtonian Land Mammal Age from Haile XVI A, if 
the specific identification is correct. See Geologic age under T. macrodon 
for additional details regarding western occurrences. 
Diagnosis. — As for T. macrodon, but smaller. 
Description of eastern specimen. — The right mandibular ramus from 
Haile XVI A, Florida, UF/FSM 27509, is complete and well preserved 
except for the anterior extremity, including the symphyseal region (Fig. 
7B,E). The coronoid process is triangular in outline, with a rather acute 
apex, in contrast to the lobate outline with rounded apex in UO 16352 
(Shotwell 1970:fig. 37J,K). The incomplete alveoli of Pj reflect crowding 
between canine and Pj, with the tooth oriented obliquely and the poste- 
rior root situated medial to the anterior root of Pj. P^ is relatively broad, 
with a marked posterior heel, completely cingulate, and with a slight 
