Skip to main content

Table 1 Sedimentary key attributes for distinguishing the five defined subfacies within the BDM-B2 core

From: Multi-proxy facies analysis of the Opalinus Clay and depositional implications (Mont Terri rock laboratory, Switzerland)

Core BDM-B2

Sedimentary petrography

Colour

Grain size

Composition

Bioturbation

Structure/bedding

SF1

Dark grey

Fine mudstone

Argillaceous

Weakly bioturbated

Homogeneous

SF2

Medium-dark grey

Medium mudstone

Argillaceous–siliceous

Sparsely bioturbated

Laminated

SF3

Medium grey

Coarse to sandy mudstone

Siliceous–argillaceous

Moderately bioturbated

Lenticular

SF4

Medium-light grey

Sandy mudstone to muddy sandstone

Siliceous–calcareous

Strongly bioturbated

Lenticular to flaser

SF5

Light grey

Sandy mudstone to muddy sandstone

Calcareous

Churned

Homogeneous