International Space Station 800mm Photograph

Image credit:  Image Science and Analysis Laboratory, NASA Johnson Space Center (http://eol.jsc.nasa.gov)

 

 

SAN PEDRO MOLLUSK SHELL FOSSILS  33.74N, 118.28W

Lomita Marl

San Pedro Formation

The link is to a general geology of Orange County California including the Lomita Marl from the Pleistocene Epoch.

"The Pleistocene deposits that mainly occur along the northern flank of the Palos Verdes Hills and in San Pedro consists of middle Pleistocene Lomita Marl, Timms Point Silt and San Pedro Sand unconformably overlain by upper Pleistocene Palos Verdes Sand. The Lomita Marl contains a fossil assemblage dominated by abundant mollusks and foraminifers indicating outer sub-littoral, moderately deep cool water in the lower beds and warm shallower inner sub-littoral water in the upper beds. The Timms Point Silt contains an assemblage of abundant mollusks and common foraminifers indicating deposition at depths greater than 92 meters in cool water. The Sand Pedro Sand contains a scattered assemblage of common mollusks indicating deposition at a depth of 92 meters near base, to about 18-27 meters at top in a mostly deltaic environment. The overlying Palos Verdes Sand contains very abundant mollusks indicating deposition in warm water at depths ranging from 0 to 27 meters, which is inner sub-littoral. Of the approximately 13 terraces that step up the Palos Verdes Hills, only the youngest and lowermost three or four terraces have provided the prolific fossil finds." From a description of a talk given by  Stephen E. Jacobs  "PALOS VERDES PENINSULA: SURVIVORS OF THE WORLD'S RICHEST COLLECTIONS OF PLEISTOCENE MARINE INVERTEBRATE FOSSILS" GSA   - Cordilleran Section - 101st Annual Meeting (April 29–May 1, 2005)

 

 

 

 

 

 

 

 

LOMITA MARL

 

1X MAGNIFICATION (RED LINE = 1MM)

2X MAGNIFICATION (RED LINE = 1MM)

 

 

3X MAGNIFICATION (RED LINE = 1MM)

3X MAGNIFICATION (RED LINE = 1MM)

 

 

 

3X MAGNIFICATION (RED LINE = 1MM)

 
   

SAN PEDRO FORMATION

 

1X MAGNIFICATION (RED LINE = 1MM)

2X MAGNIFICATION (RED LINE = 1MM)

 

 

3X MAGNIFICATION (RED LINE = 1MM)

4X MAGNIFICATION (RED LINE = 1MM)

 

 

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