Table 3 Sorting conditions of DBSeabed gravel, sand, mud percentage into Folk classification (compare Fig. 4 for a visual representation of the classification system).

From: A global coastal permeability dataset (CoPerm 1.0)

Folk class

Defining condition

Gravel (G)

Gravel % ≥ 80%

muddy Gravel (mG)

80% < Gravel % ≥ 30% & Muddy % ≥ Sand %

gravelly Sand (gS)

30% < Gravel % ≥ 5% & Sand % > Sand % & Mud % * 9 < Sand %

Mud (M)

Gravel % < 5% & & Mud % > Sand % * 9

Sandy Mud (sM)

Gravel % < 5% & Mud % > Sand % & Sand % * 9 ≥ Mud %

muddy sandy Gravel (msG)

80% < Gravel % ≥ 30% & Sand % > Sand % & Mud % * 9 ≥ Sand %

muddy Sand (mS)

Gravel % < 5% & Sand % > Mud % & Mud % * 9 ≥ Sand %

sandy Gravel (sG)

80% < Gravel % ≥ 30% & Sand % > Sand % & Mud % * 9 < Sand %

gravelly Mud (gM)

30% < Gravel % ≥ 5% & Muddy % ≥ Sand %

gravelly sandy Mud (gmS)

30% < Gravel % ≥ 5% & Sand % > Sand % & Mud % * 9 ≥ Sand %

Sand (S)

Gravel % < 5% & Sand % > Mud % * 9

  1. The Folk-Classes were adopted here as coastline permeability classes.
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