unusual red and black horizontal striped rock held between fingers

bedrock clasts close clues compaction devonian digenesis digits dirty earth environment environmental facies ferric geologist geology geoscience hand horizontally indicator jasper model old oxide oxygenated oxygenation particles permian primordial record redbed sample science sedimentary sedimentology sequence shale siltstone spider strata stratigraphic stratigraphy stratum time triassic webs