The Blancan, Irvingtonian
, and Rancholabrean mammal ages.
All the bones have been dated to the Irvingtonian
period, which spanned 1.
If this scenario is correct, then perhaps the specimen dates back to earlier Irvingtonian
times corresponding with both the "smallish" armadillo scute from the Slaton Quarry (see Dalquest & Schultz 1992), and reflecting the temporal size trend for D.
The Gila monster may have been widely distributed in the Mojave and Colorado Deserts around this time as Pleistocene (Rancholabrean) fossils are known from Gypsum Cave in Clark County, Nevada (Brattstrom 1954), and a late Irvingtonian
fossil of Heloderrna spp.
Kurten and Anderson (1980) reported at least 20 sites from across North America, including several that are late Irvingtonian
in age although most are Rancholabrean.
Aztlanolagus (Lagomorpha: Leporidae) is currently considered a monotypic genus from the Irvingtonian
4 million years to a period known as the Irvingtonian
North American Land Mammal Age.
SCIENCE, POLITICS, THE PUBLIC AND PROTECTING CALIFORNIA'S COASTAL MARINE ECOSYSTEMS 12:20-1:20 LUNCH BREAK 143 1:20 A NEW IRVINGTONIAN
LAND MAMMAL ASSEMBLAGE FROM THE SAUGUS FORMATION, MOORPARK, VENTURA COUNTY, CALIFORNIA.
Equus from the Leisey Shell Pit 1A and other Irvingtonian
localities from Florida.
columbi and usually is in older faunas (late Irvingtonian
and early Rancholabrean, rather than late Rancholabrean land mammal age; Morgan and Lucas, 2005).
The age of the Kennewick sequence is not well established, especially for the lower portions of the section, which may be entirely within the Rancholabrean mammal age (Rensberger and Barnosky 1993) or may include an Irvingtonian
mammal age faunal component (Bell et al.
The dimensions of these metapodials (Tables 1, 2) are similar to those of Equus species A from the Irvingtonian
Leisey Shell Pit of Florida.