Smithsonian miscellaneous collections . ATION ^ The San Jon formation rests on the nearly horizontal but slightlyirregular top of the Basal Sand. Its thickness is controlled by thebasin in which it was deposited and by the extent of subsequenterosion. The deepest part of the depositional basin was to the northnearer to the head of the present canyon than to the southern edgeof the basin. At the end of San Jon time the thickest part of thedeposit in the depression was at the lowest part of the basin. Latererosion, however, has reduced the original thickness, and it is probablethat a complete an
Smithsonian miscellaneous collections . ATION ^ The San Jon formation rests on the nearly horizontal but slightlyirregular top of the Basal Sand. Its thickness is controlled by thebasin in which it was deposited and by the extent of subsequenterosion. The deepest part of the depositional basin was to the northnearer to the head of the present canyon than to the southern edgeof the basin. At the end of San Jon time the thickest part of thedeposit in the depression was at the lowest part of the basin. Latererosion, however, has reduced the original thickness, and it is probablethat a complete and uneroded section is not encountered except in thesouthern portion of the basin. At places near the center of the basinwhere the original thickness is best preserved the formation is over The name San Jon formation is here proposed to include those strata here-inafter described. It derives its name from the San Jon site and exposures theredeveloped are considered to represent the type exposures. SWIITHSOPJIAN MISCELLAMEOUS COLLECTIONS. ^^/?^ I. ?f. I.:
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