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Calcarenite of the Yamama Formation (Lower Cretaceous). |
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Thickness | |
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Sulaiy Formation: |
(meters) | |
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Aphanitic limestone, golden-brown, tight, partially dolomitized .................................................................... |
2.0 |
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Pellet calcarenite, golden-brown, moderately sorted, medium- to coarse- grained, tightly cemented; abundant Foraminifera and pelecypod debris |
1.8 |
|
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Calcarenitic limestone, light-brown, moderately porous, chalky; 20 percent coarse-grained pelecypod and gastropod shell debris. Original shell material altered to clear, coarsely crystalline calcite. Lower 1.0-m-thick bed is tan aphanitic limestone. ..................... |
3.2 |
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Pellet calcarenite, tan, fine-grained, well-sorted, tightly cemented; abundant Foraminifera ..... |
2.0 |
|
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Aphanitic limestone, tan, moderately porous, chalky; very rare thin beds of brown, moderately porous, chalky pelecypod calcarenitic limestone ..... ..... .......... .. |
35.5 |
|
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Covered interval; thickness unknown ........ |
? |
|
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Aphanitic limestone, tan, moderately porous, chalky; thin beds of tan chalky, medium- to coarse - grained, pellet- molluscan calcarenitic limestone occur near top ......... |
5.1 |
|
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Pellet calcarenite, dark-brown, well-sorted, fine-to medium-grained, tightly cemented; thin bed of tan chalky aphanitic limestone occurs in upper part ... |
4.0 |
|
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Aphanitic limestone, tan, moderately porous, rarely pelletal; common outlines of monaxon sponge spicules. A 2.0-m-thick bed of brown, rarely sandy, chalky, pellet calcarenitic limestone occurs near middle ... |
5.5 |
|
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Pellet calcarenite, golden-brown, well-sorted, very fine grained, tightly cemented ... |
1.5 |
|
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Aphanitic limestone, tan, moderately porous, chalky; rare scattered molluscan debris and some sponge spicules. Occasional thin beds of brown tight, fine-medium-grained, pellet calcarenitic limestone ... |
14.5 |
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Base of section probably near slump contact of Arab and Sulaiy Formations. |
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|
STEINEKE M. & BRAMKAMP R.A. [1952].- Geology
of the Arabian Peninsula. Sedimentary Geology
of Saudi Arabia. A review of the sedimentary geology of Saudi Arabia as
shown on USGS Miscellaneous Geologic Investigations Map I-270 A, Geologic Map
of the Arabian Peninsula, 1963. Geological Survey Professional Paper 560-D, Washington, 147 p.
From page D140.
Reprinted by courtesy of the
U.S. Geological Survey, U.S. Department of the Interior.
