Fig. 9: Shock lamellae in grains in middle-Eocene sediments from the 43/25-1 well.
From: Multiple lines of evidence for a hypervelocity impact origin for the Silverpit Crater
a SEM image of cuttings sample 463 m, showing larger silt grains in a clay-rich matrix. Labelled quartz grain is shown in (b). b Quartz grain from 463 m showing shock lamellae. c U-stage results for quartz mineral in b, showing straight lamellae with a {10-13} and a {10-14} orientation. d–f Transmitted-light photomicrograph (d) and SEM images (e, f) of a k-feldspar grain from 494 m, showing amorphous lamellae decorated with fluid inclusions. Note that the lamellae behaved in a cohesive manner during deformation.
