This file includes new data on the greyscale density (8-bit) from the core 4523-A, western part of the Bohemian Cretaceous Basin. The interval covers the uppermost Cenomanian through Middle Turonian. The data were extracted from high-resolution (~10 pixels/mm) photographs using the image-processing software ImageJ (National Institutes of Health, Bethesda, MD).

High-resolution (~10 pixels/mm) photographs taken under uniform light conditions; the greyscale log was extracted using the image-processing software ImageJ (National Institutes of Health, Bethesda, MD).