2010 Overboard in the Mojave - Biological Science - California State ...

Fossil dire wolf, mammoth, and horse were recovered in
coarse Mojave River sands during monitoring of development
near Village Drive and Amargosa Road (Reynolds,
2006). The presence of the dire wolf (Canis dirus) suggests
a 0.2 Ma Rancholabrean North American Land
Mammal Age (Bell and others, 2004) for the uppermost
ancestral Mojave River sediments immediately below the
Victorville Fan sequence. Fossil mammals from north of
Air Expressway (Air Base Road) include giant ground
sloth (Paramylodon sp.), short-faced bear (Arctodus sp.),
mammoth, horse, camel, llama, giant camel (Titanotylopus
sp.), and a meadow vole (Microtus sp.) (Scott and others,
1997). These mammals, particularly Titanotylopus and
Microtus, suggest an early Pleistocene age, less than 1.3 Ma,
for ancestral Mojave River sediments. The occurrence of
the fossil cotton rat (Sigmodon minor) on Hesperia Road
(Reynolds and Reynolds, 1994) suggests a Pliocene age
for sediments along the Mojave River south of I-15.
52.8 (0.1) TURN RIGHT (east) on to Air Expressway
and proceed to National Trails Highway.
54.0 (1.2) TURN RIGHT (south) on to Air Expressway
and proceed toward Victorville and I-15.
55.1 (1.1) Continue past a thick sequence of sediments
containing thin sections of the lower fluvial unit, the thin,
lacustrine middle unit, and a thick section of the ancestral
Mojave River gravels as the upper unit (Reynolds and
Cox, 1999).
55.7 (0.6) Junction with I-15 in Victorville (services
available) and the end of the trip. Options for routes
home include following I-15 east toward Barstow to reach
Arizona and Nevada. I-15 west (southbound) reaches San
Bernardino and the Los Angeles basin. Bakersfield can be
reached by backtracking to Air Expressway, proceeding
west to Highway 395, then north to Highway 58.
End Day 3
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22 2010 Desert Symposium