Pacific Muck
The Pacific Muck is an informal designation for late Pleistocene and Holocene deposits cropping out and found in subsurface in the vicinity of Panamá City, in Panamá Province, Panama. These deposits include black organic-rich mud (muck), lignite, and coarse fossil-rich sand. These sediments and their fossils suggest deposition in coastal habitats, including mangrove swamps, intertidal mudflats, and shallow subtidal environments.
Common fossils
 Anadara concinna (G. B. Sowerby I, 1833) |
 Anadara nux (Linnaeus, 1758) |
 Leptopecten tumbezensis (Spengler, 1798) |
 Mexicardia procera (Gmelin, 1791) |
 Eucrassatella gibbosa (Linnaeus, 1758) |
 Mactrotoma californica (Linnaeus, 1758) |
 Eurytellina rubescens Linnaeus, 1758 |
 Eurytellina inaequistriata (Gmelin, 1791) |
 Tellina tabogensis (C. B. Adams, 1845) |
 Tagelus politus (G. B. Sowerby II, 1841)
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 Chionopsis amathusia (R.A. Philippi, 1844) . |
 Lamelliconcha paytensis (Linnaeus, 1758) |
 Caryocorbula ovulata
(G.B. SowerbyI, 1833) |
 Tenuicorbula tenuis (G.B. SowerbyI, 1833) |
 Natica unifasciata Lamarck, 1822 |
 Nassarius pagodus (Reeve, 1844) |
 Cosmioconcha modesta (Powys, 1835) |
 Prunum sapotilla (Hinds, 1844) |
 Strioterebrum glaucum (Hinds, 1844) |
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