In some deep spots further west, grey, white, red, and yellow clays have been deposited in small beds over each other, giving them the appearance of variegated MARLS.
"The Former Philippines thru Foreign Eyes"
Tomás de Comyn Fedor Jagor Rudolf Ludwig Carl Virchow Charles Wilkes
The Oeningen strata consist of a series of MARLS and limestones, many of them thinly laminated, and which appear to have slowly accumulated in a lake probably fed by springs holding carbonate of lime in solution.
"The Student's Elements of Geology"
Sir Charles Lyell
In the 19th bed are numerous fish, insects, and plants, below which are MARLS of a blue indigo colour.
"The Student's Elements of Geology"
Sir Charles Lyell