The feeding habits and reproduction of Utastansburiana, Crotaphytus collaris and Cnemidophorus tigris during spring and summer 1976 are described. Feeding habits are expressed in percent total number and volume of prey items and frequency of occurrence of each prey category . Importance Values are also calculated. These values better i llustrate the feeding habits of the lizard species than either percent total number and volume and frequency of prey category occurrence. Lizards consume a variety of food items throughout the growing season. Hymenoptera, Coleoptera, Orthoptera and Arachnida are the major prey categories of Q. s t ansburiana . The major prey categories of C. collaris and C. tigris are Orthoptera, Hymenoptera and Coleoptera and Orthoptera, Lepidoptera, Coleoptera, and Arachnida, respectively. Dietary overlap between species and food species diversities (numbers and volume) are also used to illustrate the feeding habits. Reproduction is assessed by clutch size and frequency . Clutch size of Q. stansburiana , f· collaris and f· tigris is 2.99, 5.38 and 3.07, respectively. All species laid one clutch of eggs in 1976.

The majority of the Middle Cambrian Wheeler Formation in the Drum Mountains was deposited during a single 3rd order sequence. Superimposed onto this sequence are three indistinct 4th order cycles and twenty distinct 5th order cycles. These higher order cycles were likely deposited within short intervals of geologic time (204 to 405 ky). The lower sequence boundary zone occurs within the Swasey Formation. The Transgressive Surface is the contact between the Swasey and Wheeler Formations. The Maximum Flooding Surface is located near the top of the lower Wheeler Formation, which also approximates the base of the Ptychagnostus atavus range zone. The upper sequence boundary is marked by stromatolites, which occur near the top of the upper member of the Wheeler Formation in the Drum Mountains. Deposition of the Wheeler Formation in the Drum Mountains was controlled by eustacy and tectonics. Local normal faulting associated with Middle Cambrian postrifting thermal subsidence may have caused some of the 5th order cycles. The cycles and surfaces defined in this stratigraphic analysis, and the base of the Ptychagnostus atavus and P. gibbus range-zones, can be used to correlate strata occurring in other localities in the eastern Great Basin. In addition, this study enables the evaluation of the effect of tectonics (faulting) versus global eustacy on the sedimentary regime occurring within the Middle Cambrian House Range Embayment.