Imbricated

Imbricate refers to clastics sediments that are laid down with a preferential orientation of the composing grains.^[1] This is most often applied to conglomerates and gravels. It is generally related to paleoflow direction.^[2] Wadell^[3] found the long axis aligned with paleocurrent, and dipping basinward in glacial sediments, whereas deltaic gravels may be oppositely inclined.^[4]

References

1. ^ Pettijohn, F. J., 1957, Sedimentary Rocks, Harper and Row, Second Edition p. 78
2. ^ Becker, G.F., 1893, Finite homogenous strain, flow, and rupture of rock, Bull. Geol. Soc. of Amer., 4, pp. 13-90; cite in Pettijohn, 1957.
3. ^ Wadell, H., 1936, Shape and position of rock fragments, Geografiska Annaler, pp. 74-92, cite in Pettijohh, 1957.
4. ^ Krumbein, W. C., 1940, Flood gravel of San Gabriel Canyon, Bull. Geol. Soc. of Amer., vol. 51, pp. 636-676.