12.110 Image Gallery: Lab 3 - Sandstone with preserved tool marks. Paleo flow was parallel with tool marks, but exact direction of flow can not be known from tool marks.

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Sandstone with preserved tool marks. Paleo flow was parallel with tool marks, but exact direction of flow can not be known from tool marks.

Sandstone with preserved tool marks. Paleo flow was parallel with tool marks, but exact direction of flow can not be known from tool marks. (Image courtesy of OCW.)