Shell Sand (Substrate Subclass)

Component: Substrate

Unique Identifier: 322

Substrate Origin	Biogenic Substrate
Substrate Class	Shell Substrate
Substrate Subclass	Shell Sand
Substrate Group	Coquina Sand

Description

Definition

Biogenic Substrate layers that are dominated by Sand that is primarily composed of shell particles with a median particle size of 0.0625 millimeters to < 2 millimeters (Sand). Shells or remains are generally broken and difficult to identify. For this reason, only substrate-forming taxa that produce distinctive Sand types are listed as substrate groups. When the composition and origin of Sand is unclear, it is assumed to be mineral Sand and is classified as a Geologic Origin substrate.