Unit Unit 4 Color Thickness Description 3mm cemented dk gray silt at upper contact 5 48 cm med grayish tan muddy siltstone becoming mudstone in uppermost 15 cm 6 25 cm repeating unit-5 becomes mudstone in upper 10 cm. Limonite yellow streaks 7 70 cm med gray tan vf-a clayey sand or siltstone, angular, apparently massive occasional limonite staining. with clay laminae in lower half. (5mm thick) 8 interbedded siltstone, silty clay yellowish tan limonite stained interbeds 3-5 cm