Geographic setting. _ ________________________________ Major landforms_____ ___________________________ Carson Desert and adjoining basins.--.-______ Highlands bordering the basins-T __ ___________ Climate _______________________________________ Drainage ______________________________________ Vegetation. _ ___________________________________ Economic geography ____________________________ Tertiary stratigraphy and structure_____________ ______ Stratigr aph y.___. ______________________________ Basalt of Rainbow Mountain _ ______________ Dacite of Rainbow Mountain. _______________ Eagles House rhyolite _______________________ Truckee formation. _________________________ Bune jug formation. _________________________ Structural features. _ ____________________________ Pre-Truckee faults. _________________________ Faults of post-True kee and early Bune jug age__ Structural features of post-Bunejug pre-Paiute age______ Basin-and-range faults. _ __________.__.._.___.___. General features. ___________________________ Faulting in specific areas_____________________ Configuration of the bedrock floor of the basin _____ Quaternary stratigraphy.. _ __________________________ Methods of study_____ __________________________ Stratigraphic usage _____________________________ Soils. _________________________________________ Definition and general features _______________ Soil profile. _ _______________________________ Classification. ______________________________ Descriptive terminology _____________________ Great soil groups ___________________________ Pre-Lake Lahontan erosional features _____________ Pre-Lake Lahontan Quaternary stratigraphy _______ Basalt of Rattlesnake Hill ___________________ Pre-Lake Lahontan lacustrine sediments___.___ Paiute formation ___________________________ Buried pre-Lake Lahontan Quaternary sediments -_-__-__-------____________________ Cocoon soil-_______________________________ General features and relations. ___________ Profile characteristics ___________________ Age__ _________________________________ Lahontan Valley group.

In three experiments we tried to mask the motions of human gait. We represented human walkers as a set of 11 computer-generated elements on a display monitor, moving as a nested hierarchy of motions that mimicked the motions of the head and major joints. The walker was seen in sagittal view, facing either right or left.and walking as if on a treadmill. On the walker was superimposed a simultaneous mask composed of elements with the same brightness, shape, and subtense as those of the walker. We varied the mask parameters-particularly the number of elements and style of motion-to discern what masks best camouflaged the walker's direction. In general, many kinds of masks impeded viewer performance at durations of 200 msec, but only relatively complex masks continued to impede performance to 400 m.sec and beyond. Four results stand out concerning the concurrent perceptual organization of target and mask. First, if the mask is easily divided into groups by its motion parameters, viewer performance with respect to the stimulus is generally impeded by increasing the number of groups in the mask. Second, the most successful masks are those composed of scrambled parts of walkers. Third, given a sufficient number of scrambled-walker elements, viewer performance does not improve above chance even at 800 m.sec. And fourth, this lack of improvement appears to be confined to scrambledwalker masks that share the particular gait parameters of the walker target.Those who study the perception of certain types of events often use the term biological motion for patterns of movement generated by living forms. By far the most frequently studied biological motion is human gait (e.g

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the middle and upper parts of the canyons that are correlated by Richmond (1961, 1964) with the early, middle, and late stades, respectively, of the Pinedale Glaciation. Consequently, the Draper Formation is correlated with the drift of this glaciation. The lower, middle, and upper tongues of this formation are matched by, and probably correlate with, deposits of the early, middle, and late stades, respectively, of the Pinedale Glaciation. PREVIOUS STUDIES The reports of the exploration of the 40th parallel briefly mention the Lake Bonneville shorelines and the evidence for glaciation in the Wasatch Range; they 65 64.