Deformed agglomerates near Tintagel, North Cornwall

Abstract

It is shown that fragments in agglomerates, which occur in chlorite schists near Tintagel, may have been both flattened and constricted. Flattening was probably associated with formation of the schistosity, and constriction with later boudinage.

Down-plunge viewing: a rapid method for estimating the strain ellipsoid for large clasts in deformed rocks

“…This method is based on viewing jaI-ge ob-katchewan, suggest that this method is useful parjects, such as and boulders, down the ticularily for comparing regional differences in plunge of two (or all three) of the principal axes of moderately to highly deformed rocksthe strain ellipsoid. It is an extension of the method used by Hossack (1968), Gay (1969), and Hobson (1971), all of whom measured clast dimensions in nattmrally occurring outcrop planes orthogonally related to principal strain directions (bedding, foliation, and joints). Though probably lacking the precision of methods such as those developed by Dunnet (1969), Dunnet andSiddans (1971), andElliott (1970) for large objects, this method is more rapid, can be applied in the field without the necessity of taking large samples back to the laboratory, and can be used on somewhat rounded outcl-ops where there are no planes of view normal to the strain axes.…”