Phosphate-bearing marine chemical sediments in a sequence of quartz sandstone, siliceous sediments, shale and dolomite. The phosphate-bearing bed is underlain by a manganese deposit consisting mainly of manganese carbonates.
Ref.:
- USGS Open-file report 02-156
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Map Reference: 18°25'N , 109°39'E
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Mineral List:4 entries listed. 3 valid minerals.
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