GEOLOGY AND PALEONTOLOGY OF PALOS - Pubs Warehouse

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GEOGRAPHY FIOUIIE 1. Sketch map of Los Angeles Basin and borders showing location of Palos Verdes Hills with reference to other geographic features. Hoots and Kew (16th Intcrnat. Geol. Gong. Guidebook 15, pi. 6, 1932). Crops are grown in the Palos Verdes Hills without irrigation, but farther inland the same crops need irriga tion for successful maturing, despite the greater rainfall. The .maturing of crops without irrigation in the Palos Verdes Hills is.controlled by higher relative humidity and more equable temperatures, owing to proximity of the ocean. Point Vicente on the south coast of the hills has a mean relative humidity of 71 percent; at Los Angeles the noon mean relative humidity is 51 percent. 17 August, the warmest summer month, has a mean tem perature of 66.5° F. at Point Vicente, 67° at San Pedro, and 71° at Los Angeles. The high fogs that are preva lent in the morning along the coast during the spring and early summer are an important factor, as they reduce evaporation during the growing season of most of the crops. The soils under cultivation in the Palos Verdes Huls consist principally of clay loam and clay adobe, 18 Avhich retain moisture. The soil is plowed under proper moisture conditions soon after the first winter rains. In the vegetable-growing districts it is frequently cultivated to reduce evaporation. The soils of the lower part of the Monterey shale are generally brownish and contain numerous stones, com posed of hard cherty shale, .and larger pieces of lime stone. In cultivated areas the largest pieces of lime- » The time of day is not specified for the Point Vicentc records, but is presumably noon. At Los Angeles the mean relative humidity is 77 percent at 8 a. m., 51 percent at noon, and 01 percent at 8 p. m. '« Nelson, J. w., and others, Soil survey of the Los Angeles area, Calif.: U. S. Bur. Soils Field Operations Advance Sheets, 78 pp., 3 pis., map, 1919 (18th Ann. Kept., pp. 2347-2420, 3 pis., map. 1921). Adapted from stone are usually gathered and dumped on steep slopes between terrace treads or into ravines. (See pi. 24, D.) The soils of the upper part of the Monterey shale are darker, dark gray to black, and generally contain few stones. The residual basalt soils and the nonresidual terrace-cover soils are reddish brown, but the terrace- cover soil is more sandy than the basalt soil. The lower part of the southwest, south, and southeast slopes and small areas along the lower course of George F Canyon and on the north slope, east of the Palos Verdes golf course, are leased to tenants living on small tracts. Fresh vegetables, principally tomatoes and squash, but also beans, peas, cucumbers, and corn are. grown in these districts. The lower terrace treads are most ac cessible and most readily -tilled. Some rises that are not too steep and a few terrace treads and flats high on the south slope are under cultivation. The rolling up land along the crest and upper slopes and most of the north slope are leased to tenants living on large ranches. Lima beans, which are dried for the market, are grown on areas of gentle declivity along the western part of the crest and on adjoining parts of the north and south slopes, mostly on the dark soils of the upper part of the Monterey shale. Barley, generally used for hay, is grown on part of the rolling upland and on gentler de clivities of the north slope, and wild oats are cut for hay on some of the steeper slopes. Part of the northeast slope near San Pedro is used for dairy pasturing. Sheep are grazed during part of the
10 GEOLOGY AND PALEONTOLOGY OF PALOS VERDES HILLS, CALIFORNIA Middle'Miocene nniiN uiuiiiiiiiiiiiimnTmn Lower Miocene and Oligocene (?) .'.' Upper Cretaceous LOS ANGELES BASIN NORTH OF NEWPORT INGLEWOOD UPLIFT Vertical scale 1000 0 1000 5000 Feet FIGURE 2. Generalized stratigraphic sections in western part of Los Angeles Basin and its borders. Santa Monica Mountains section after Hoots (U. S. Geol. Survey Prof. Paper 165-C); Los Angeles Basin sections compiled from various sources.
Page 1: UNITED STATES DEPARTMENT OF THE INT
Page 4 and 5: IV CONTENTS Stratigraphy and paleon
Page 6 and 7: GEOLOGY AND PALEONTOLOGY OF PALOS V
Page 8 and 9: and paleontology and a general acco
Page 10 and 11: 1902. Arnold, Delos, and Arnold, Ra
Page 12 and 13: 1933. Davis, W. M., Glacial epochs
Page 16 and 17: year on the north slope, and small
Page 18 and 19: correlation with the Franciscan of
Page 20 and 21: LITHOLOGIC UNIT MIOCENE SERIES ' 15
Page 22 and 23: shale and porcelaneous mudstone rat
Page 24 and 25: GEOLOGICAL SURVEY PROFESSIONAL PAPE
Page 26 and 27: GEOLOGICAL SURVEY ^ HnMMHMHMHBMHMHM
Page 28 and 29: part of the Altamira shale in the P
Page 30 and 31: slide debris that may conceal a fau
Page 32 and 33: Section of middle part of Altamira
Page 34 and 35: pi) a tic shale, and limestone in t
Page 36 and 37: is in the upper part of the sandsto
Page 38 and 39: Section of upper part of Altamira s
Page 40 and 41: Section of Monlerey shale, includin
Page 42 and 43: MIOCENE SERIES Foraminifera from up
Page 46 and 47: GEOLOGICAL SURVEY PKOFESSIONAL PAPE
Page 50 and 51: there appears to be no displacement
Page 52 and 53: oad from Girard to Mohn Spring in t
Page 54 and 55: nose of a spur on the north side of
Page 56 and 57: is used for the formation in that a
Page 58 and 59: spring of 1938. Owing to urban and
Page 60 and 61: y Crickmay u to the Santa Barbara f
Page 62 and 63: The base of the San Pedro sand is d
Page 64 and 65:
y Dr. Hampton Smith, Bryozoa and mo
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GEOLOGICAL SURVEY PROFESSIONAL PAPE
Page 68 and 69:
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including numerous specimens of Bit
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gravel as much as 20 feet thick mad
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fossils were found near the seaward
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NORTHERN SAN PEDRO In the northern
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Page 80 and 81:
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is at an 1 altitude of 365 feet, mu
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son tod by 43 collections in the ma
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fiocl as M. cf. M. varitosa. M. var
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a width of 3.3 millimeters. Only th
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ased on fossils from San Pcdro, is
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Pedro district, is recognized in th
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According to Arnold's description o
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midellids are on record, half of wh
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fortis is widespread and locally ab
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Progabbia cooperi occurs in the Lom
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ANOM1IDAE The Recent California spe
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opuntia survived from the Pliocene
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millimeters) from Puget Sound. The
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lower Pleistocene units, in deposit
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in interpreting the Pleistocene pal
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PLEISTOCENE SERIES 89 Pleistocene m
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There are no shallow-water Littorin
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localities therefore are inferred t
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locality 70 species of gastropods a
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is better known. Calicantharus is a
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The species in the preceding list b
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It is apparent from the preceding t
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graphic or depth range have taken p
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Pedro district. The close faunal si
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age extend over an entire terrace.
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eludes volcanic agglomerate or brec
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San Pedro district, where those str
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during cutting of the Pleistocene m
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GEOLOGICAL SURVEY AIIil'LANE VIEW O
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116 GEOLOGY AND PALEONTOLOGY OF PAL
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G92787 45 10 PLATES 28-37 127
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GEOLOGICAL SUEVEY PROFESSIONAL PAPE
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PLATE 29 [Species and varieties ill
Page 161 and 162:
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Page 173:
PLATE 37 [Species illustrated still
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Page Calicantharus fortls..........
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142 INDEX Page kennerlyi, Mercenari
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144 INDEX Page Rissoinidae_________
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