Googling, I see the source of your consternation; "lumachelic" means "lumachelic." There is some suggestion that "mechanism of deposition" is involved in the definition, but I guarantee nothing at this stage of my inquiry/investigation of this somewhat circular "argument?" More a "mechanical" than sedimentary/chemical/"Bahamian whiting" type origin.
NIVEL LUMAQUELICO: se denomina lumaquela a toda roca sedimentaria, normalmente de matriz caliza, que contiene una proporción importante de restos de conchas de moluscos o esqueletos de otros animales fosilizados. El nivel 31 lumaquelico comprende una capa de rocas sedimentarias que guardan en su interior restos de seres vivos descompuestos y fosilizados.
LUMAQUELIC LEVEL: Lumaquela is called any sedimentary rock, usually of limestone matrix, which contains a significant proportion of shell remains of mollusks or skeletons of other fossilized animals. The level 31 lumaquelico comprises a layer of sedimentary rocks that keep in their interior remains of decomposed and fossilized living beings.
In other geologic terms it is "fossiliferous" rocks or formations
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