Computerized Trigonometric Method for Rotation of Structurally Tilted Sedimentary Directional Features

Parks, James M.

doi:10.1130/0016-7606(1970)81[537:ctmfro]2.0.co;2

Cited by 17 publications

(2 citation statements)

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“…Vector means (Potter and Petti John, 1963, p. 264) were computed for individual localities, subareas, and stratigraphic units. All computations were made by computer using a modified version of the program of Parks (1970) for the rotation operation. For a few obviously bimodal distributions, the two means were estimated by a computer program written by W.R. James and T.A.…”

Section: Methodsmentioning

confidence: 99%

Sedimentology of the Simmler and Vaqueros formations in the Caliente Range-Carrizo Plain area, California

Bartow¹

1974

Open-File Report

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The Simmler and Vaqueros Formations in the Caliente Range-Carrizo Plain area make up a large part of the thick Tertiary sedimentary sequence that was deposited in a basin which lay along the southwest side of the present-day San Andreas fault. The evolution of this basin during Oligocene and early Miocfene time and the relationship of its sedimentary record to the tectonic history is an important chapter in the Tertiary history of California. The Simmler Formation, of provincial Oligocene to early Miocene age, unconformably overlies basement rocks and an Upper Cretaceous-lower Tertiary marine sequence. It consists of a sandstone facies, which is mostly a variegated sequence of sandstone and mudstone occurring in fining-upward cycles, and a conglomerate facies, which occurs around the southwest and southeast margins of the basin. The conformably overlying Vaqueros Formation, of provincial early to middle Miocene age, is subdivided from base upward .into the Quail Canyon Sandstone, Soda Lake Shale, and Painted Rock Sandstone Members. The Vaqueros intertongues eastward, southeastward, and northward with the continental Caliente Formation and is conformably overlain by the Monterey Shale. In the Caliente Range, northeast of major thrust faults, the Vaqueros may reach a thickness of 8,700 feet (2,650 m). Around the margin of the basin, the formation is much thinner locally only 200 feet {60 m) thick and is generally undivided. The Quail Canyon Sandstone Member is composed of cross-bedded or planar-stratified sandstone. The Soda Lake Shale Member consists mostly of siltstone and platy shale with a few thin sandstone interbeds. The Painted Rock Sandstone Member, the thickest and coarsest member, consists mostly of large lenticular bodies of thick-bedded coarse-grained sandstone and thinner units of si Itstone. Petrology and paleocurrent studies indicate that, in a given subarea, the Simmler and Vaqueros Formations were derived from the same source terrane and that the sediments were usually transported in the same general direction. Crystalline basement terranes to the north and south v were the primary sources, but the Upper Cretaceous-lower Tertiary marine sequence made substantial contributions along the southwest side of the basin. The sandstone facies of the Simmler Formation is interpreted as an alluvial plain depositional complex formed by through-flowing low-sinuosity streams, and the conglomerate facies is interpreted as alluvial fan deposits. The Vaqueros Formation in the Caliente Range forms a transgressive-regressive sequence. The Quail Canyon Sandstone and lowermost Soda Lake Shale Members represent the transgressive phase, are interpreted as beach-nearshore and offshore deposits, and are locally the marine equivalents of the upper part of the Simmler conglomerate facies. The remainder of the Soda Lake Shale Member and the Painted Rock Sandstone Member represent the regressive phase and are interpreted as a complex of deltaic and shelf-slope deposits that prograded over basinal shales and turbidites. The re...

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Section: Methodsmentioning

confidence: 99%

Sedimentology of the Simmler and Vaqueros formations in the Caliente Range-Carrizo Plain area, California

Bartow¹

1974

Open-File Report

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“…47 and 48). The attitudes of the sedimentary structures were restored to horizontal orientations using computer programs developed by Parks (1970) for two-tilt restorations. Vector means, using the method of Curray (1956), and standard deviations were computed mathematically by other computer programs.…”

Section: Paleocurrentsmentioning

confidence: 99%

Stratigraphy and sedimentology of the Eocene Tejon Formation, western Tehachapi and San Emigdio mountains, California

Nilsen¹

1987

Professional Paper

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The Tejon Formation is exposed in its type area in the San Emigdio and western Tehachapi Mountains at the south end of the Great Valley of California, northwest of the Garlock fault and northeast of the San Andreas fault. It consists of breccia, conglomerate, sandstone, siltstone, and shale containing a marine megafauna and microfauna diagnostic of early, middle, and late(?) Eocene age. The formation records a major eastward transgression across the outcrop area during early and middle Eocene time, followed by a major westward regression during later middle Eocene time.The Tejon Formation consists, in ascending and conformable order, of: (1) a basal nearshore breccia, conglomerate, and sandstone, (2) finer grained sandstone and shale deposited farther offshore, (3) an upper sandstone containing some interbedded conglomerate and shale that was deposited in shallow-marine environments adjacent to a regressing shoreline, and (4) an uppermost laterally restricted shallowmarine siltstone. Paleocurrent data indicate that the dominant transport of sediment was in an offshore or westward direction.The Tejon Formation rests unconformably on a pre-Tertiary crystalline basement complex. In the central and eastern parts of the outcrop area, this basement consists of upper Meso/oic partly gneissose granodiorite, quartz monzonite, and quartz diorite that is locally migmatitic; these rocks are similar in lithology and age (77-86 m.y.) to plutonic rocks of the eastern Sierra Nevada. In the western part of the outcrop area, the Tejon rests on mafic and ultramafic rocks that include metadiabase, gabbro, pyroxenite, and hornblende-quartz diorite-gabbro for which K-Ar dates from hornblende indicate ages ranging from 130 to 220 m.y. The eastern and central areas, underlain by continental crust, formed a narrow Eocene continental shelf that deepened westward to a continental slope and deep-marine basin underlain by the mafic and ultramafic rocks.The Tejon Formation generally consists, except for the persistence of the nearshore basal conglomerate, of shallow-marine facies to the east and deeper marine facies to the west. In its eastern exposures, the marine Tejon Formation is overlain conformably by the nonmarine Tecuya Formation of Eocene(?) to Miocene age and also grades laterally eastward into nonmarine red beds inseparable from and, therefore, also assigned to the Tecuya Formation. To the west, the Tejon is overlain by the marine San Emigdio Formation of late Eocene and Oligocene age; it contains a basal shallow-marine sandstone that interfingers to the east with red beds of the lower part of the Tecuya Formation.The basal unit of the Tejon Formation is the Uvas Conglomerate Member, a discontinuous basal breccia, conglomerate, and sandstone that rests unconformably on a highly irregular erosional surface on the basement complex. Though locally absent, this member may be as thick as 400 feet (122 m) where deposited on topographic lows. Characteristic sedimentary features include medium-to large-scale cross strata, local channeling ...

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Basin mapping methods

Miall¹

1984

Principles of Sedimentary Basin Analysis

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Computerized Trigonometric Method for Rotation of Structurally Tilted Sedimentary Directional Features

Cited by 17 publications

References 0 publications

Sedimentology of the Simmler and Vaqueros formations in the Caliente Range-Carrizo Plain area, California

Sedimentology of the Simmler and Vaqueros formations in the Caliente Range-Carrizo Plain area, California

Stratigraphy and sedimentology of the Eocene Tejon Formation, western Tehachapi and San Emigdio mountains, California

Basin mapping methods

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