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- W1539862959 abstract "Widespread exposures of a thick sequence of beds composed dominantly of sandstone form a broad northwesttrending belt of outcrops in the central San Joaquin Hills [Figure 1]. These beds are assigned to the Topanga Formation. Three members of the formation have been differentiated in the area of outcrop that extends in a broad strip through the central San Joaquin Hills from Laguna Beach nearly to Upper Newport Bay [Figure 2]. In the western part of the area the Topanga Formation is subdivided in ascending order into the Bommer Member, the Los Trancos Member, and the Paularino Member, all of [provincial] middle Miocene age. In upward sequence these members are in turn dominantly sandstone; siltstone; and interbedded sandstone, breccia, and siltstone. The lower member is 2400 feet thick, the middle, 3100 feet thick, and the upper, 1500 feet thick. All Tertiary strata in the San Joaquin Hills that are younger than the Bommer Member contain varying amounts of Catalina Schists detritus indicating a western sourc e area for at least part of these sediments. Undifferentiated strata**that probably are equivalent to the lower and middle members constitute most of the outcrops in a coastal belt about a mile and a half wide north and east of Laguna Beach. A similar undifferentiated sequence lies northeast of the Laguna Canyon fault and extends southeast beyond the mouth of Aliso Creek. A relatively thin section of the Topanga Formation is exposed north of Trabuco Creek and in isolated patches in the foothills east of El Toro Air Station. A thick section of strata assigned to the formation is present in the subsurface southwest of the Pelican Hills fault zone." @default.
- W1539862959 created "2016-06-24" @default.
- W1539862959 creator A5022334053 @default.
- W1539862959 date "1979-01-01" @default.
- W1539862959 modified "2023-09-27" @default.
- W1539862959 title "THE TOPANGA FORMATION IN THE SAN JOAQUIN HILLS, ORANGE COUNTY, CALIFORNIA*" @default.
- W1539862959 hasPublicationYear "1979" @default.
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