lower chilton seam

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Sigillaria tree-- as it has stood for 308 million years
... Here, frozen in time, is the lower trunk of a Sigillaria tree sandwiched within a 34-in.-thick shale layer between the Lower Chilton Seam and a Rider Seam. This specimen was encountered during ... swamp conditions during deposition of the Lower Chilton Seam were quiet for several thousand years, allowing enough peat to accumulate to yield a coal seam that even after compaction and de-volitalization ...
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Sigillaria leaf scars
... roof immediately overhead the Lower Chilton Seam in an underground coal mine in southern West Virginia. A close-up view is available. Rock Type: Gray shale Formation: Kanawha Interval: Lower Chilton seam Age: Middle Pennsylvanian Period ...
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