Analytical and stratigraphic data on the upper phosphatic mudstone member of the Santa Margarita Formation at Newsome Canyon, southern Cuyama Valley, California

A detailed stratigraphic and geochemical program was conducted in 1978 on the strata of the upper phosphatic mudstone member of the Santa Margarita Formation at Newsome Canyon, Santa Barbara County, California, (fig 1). This program was undertaken to determine the phosphate content of each stratigraphic unit in an area of complex stratigraphy and structure. The report includes a detailed stratigraphic description of the upper phosphatic member with location of samples collected (Table 1) and a tabulation of chemical analysis for each sample (Tables 2 and 3). The chemical data indicate the marine apatite (carbonate fluorapatite) is of variable composition.