Bank Essay

1382 Words Feb 28th, 2014 6 Pages
Arizona-Nevada Academy of Science

The Geology of Two Small Cenozoic Volcanoes in Southwestern Arizona Author(s): Shelby Cave and Ronald Greeley Reviewed work(s): Source: Journal of the Arizona-Nevada Academy of Science, Vol. 37, No. 2 (2004), pp. 105-110 Published by: Arizona-Nevada Academy of Science Stable URL: . Accessed: 27/11/2011 20:48
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and pedogenic incision by ephemeral washes, and that some of the between basalt units. This suggests that the eruptions were essentially monogenetic are inaccurate. and 4.3-1.35 Ma for Gillespie dates that span from 3.28-1.28 Ma for Arlington radiogenic

on Arlington probably indicate that it is older thanGillespie, both shields exhibit comparableweathering,

are two small (~5 km and Gillespie Arlington located in south diameter) basaltic shield volcanoes western Arizona ~60 km west and 70 km southwest and of Phoenix, (Fig. 1). Arlington respectively consists of multiple flows of alkali olivine Gillespie of volcanoes basalt and are the two northeasterly from the Sentinel four small shields that trend N45 ?E


at slope initiation points, distributaries including breaks, and tributary patters that appear to be con scarps that could patterns. vegetation as small be flow fronts;

trolled by geology; (3) changes in topography such and (5)

Plains lavafield (Fig. 1).The Sentinel Plains and the shields are of similar age and composition (Leeman 1970, Shafiqullah et al. 1980, Lynch 1989). Arling at small scales by ton and Gillespie were mapped

Reynolds and Scotnicki (1993), Demsey (1989), were Wilson et al. (1957), and Reynolds (1988), and dated at 3.28-1.28 Ma and 4.3-1.35 Ma, et al. 1986). The dates were acquired in Reynolds that included conjunction with

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