Supplementary Table 1: Carbonate content from gas source mass spectrometer. Geochemistry of macrofossil, bulk rock, and secondary calcite in the Early Jurassic strata of the Llanbedr (Mochras Farm) drill core, Cardigan Bay Basin, Wales, UK

Supplementary Table 1: Carbonate content determined using gas source isotope ratio mass spectrometry. SSK (Subsample Keyworth) identifies bulk rock sample taken from aggregate bags; BLD number identifies bulk sample extracted from registered specimen. For aggregate bags sample depth is taken as the average of minimum and maximum depth of the integrated core section - typically a range of 1.4 m, for registered specimens the depth is taken from the catalogue of registered specimens with a precision of one inch.