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Cothurnia limnoriae - NSCEP | US EPA - US Environmental ...

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Level 1 Level 2 Level 3 Definition<br />

Carbonate Mixed fines primarily composed of carbonate sediments.<br />

Siliceous ooze<br />

Mixed fines composed of > 30% siliceous remains from diatoms,<br />

radiolarians, siliceous sponges, and silicoflagellates.<br />

Gravel<br />

Unconsolidated sediment composed of >75%, by weight, of particles in<br />

the range of 2 - 64 mm.<br />

Clean gravel Gravel substrate with 5% mud intermixed.<br />

Gravel w/sand Gravel substrate with > 5% sand intermixed.<br />

Mineral Gravel primarily composed of rock fragments.<br />

Carbonate Gravel primarily composed of carbonate sediments, such as maerl.<br />

Consolidated<br />

Cobble<br />

Mixed sediments<br />

Organic Sediment<br />

Rock<br />

Unconsolidated sediment composed of >75% by weight of particles in<br />

the size range of 64–256 mm. In some classifications, cobble is<br />

considered a consolidated sediment.<br />

Clean cobble Cobble sediment with 5% mud intermixed.<br />

Cobble w/sand Cobble sediment with > 5% sand intermixed.<br />

Mineral Cobble composed primarily of rock fragments.<br />

Carbonate Cobble composed primarily of carbonate.<br />

Gravelly mud<br />

Muddy gravel<br />

Gravelly sand<br />

Sandy gravel<br />

Unconsolidated sediment composed of both sand and mud with gravel<br />

or cobble, where gravel and cobble constitute >5% but 5% but 30% but 5% but 30% but 30% organic<br />

matter (> 17% organic carbon) according to Howes and Kenik (1997).<br />

Substrates composed of particles >256 mm or of unbroken rock.<br />

Substrate not moved by organisms or tidal or ocean currents except in<br />

extreme storms.<br />

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