EX1806 – Dive 04, Blake Escarpment South Published September 20, 2020 at 720 × 540 in Geological Overview: EX1806 – Dive 04 Blake Escarpment South ← Previous Next → This sample collected from this area shows that these rocks are likely mudstones – compacted clay and silt that have been encrusted with Mn-Fe precipitates, then covered with a line veneer of fine, loose brown sediments (i.e., mud).