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Preliminary Analysis Of Cores From North San Francisco Bay, California

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GC-4C Analyses


Field Descriptions of GC-4C
Core ID Length (m) Latitude Longitude Setting Description
GC4C 3.83 38� 02' 58.111 122� 23' 35.888 Middle Shoal Complete penetration; green-gray mud and shells on outside of barrel;  CC sample, shell-horizon at top of CC; Middle section: shell pieces, homogenous gray, partly coarser grained in upper part; Bottom section: homogenous gray; Top section: shell pieces, partly coarser grained, worms in upper part, homogenous gray, some brownish sediment in upper part of section.

X-radiograph (0-400 cm)

Click on the above link to view X-ray scans for GC-4B.


Magnetic Susceptibility and X-ray Descriptions

Combined graph showing magnetic values (about 40) in the upper 140 cm, followed by 100 cm of lower values (about 20), and increasing to 40 for the last 140 cm.  At 45 cm down, the magnetics peak to 80.

Click image for a larger version (87 kb JPEG)

 

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http://geopubs.wr.usgs.gov/open-file/of03-111/Analyses/GC4C/GC4C.html
maintained by Carolyn Donlin
last modified 19 February 2003 (lzt)