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Transcribe page 20 of 59
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Download PDF for SIA-SIA2017-040362 (project ID 11925)
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[[on reverse of previous page]] [[underlined]] Notes on Core #12 [[/underlined]] ~ 4316 - 4341' Top 5" consists of 2 oriented pieces of highly fossiliferous ls. (Sample W from Upper piece to Cole 6/5/52)- That may be dolomitic. The rock is porous, fairly hard - but friable. It seems to be made up almost entirely of forams (larger and smaller) and fine detritus. Third oriented piece is 5" long and shows a gradation from the porous rock desc. above to hard, dense, cavernous, tan dolomite. The dolomite appears to be completely recrystallized and cavities (up to 1/2" across) are lined with xls. - rock has translucent saccharoidal appearance. There is a total of 2'2" of hard dolomite (this almost certainly is the harder layer recorded by driller at 4320-22') Some of cavities reach 1" - these may have been formed originally by removal of corals & shells but no recognizable traces remain; parts are so dense as to resemble chert. Below tan dolomite, two oriented pieces are white, porous and friable but without recog. fossils; show only very slight eff. with cold 10% HCL. Below is 1-2" soft sand with smaller Foraminifera; & minute calcite xls - reacts violently with acid. Followed by 3 1/2 inch oriented piece foss. ls. that is moderately hard but friable and may be dolomitic Next 3 1/2 feet soft & broken (one piece with [[underlined]] Pellatispira [[/underlined]] (Eocene) sent to Cole as sample X) with hard fragments dolomitic ls. with forams in xl. matrix. Last 6" broken but oriented - similar to hard pieces in interval above; with [[underlined]] Pellatispira [[/underlined]] - dolomitic, xl., foss. [[circled]]12a[[/circled]]
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