thermal fracture

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In studies of stone and flint artefacts a thermal fracture is a break line or crack caused by excessive heating or cooling. Frost can penetrate cracks in the cortex, and prise off a flake or ‘pot‐lid’. Frost fractures are flattish with minute cracks and a pitted surface. When flint is placed in a fire it will usually shatter, with fragments detaching themselves from the surface.

Subjects: Archaeology.

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