If the nucleus were taken out, a hollow mould would remain, on which the external form of the shell with its tubercles and Striae, as seen in a, Figure 52, would be seen embossed.
"The Student's Elements of Geology"
Sir Charles Lyell
It is supposed that the lines of the Striae indicate the direction in which the rocks were moved.
"The Student's Elements of Geology"
Sir Charles Lyell
The walls of these cuttings are covered with parallel Striae, sometimes horizontal, sometimes slanting to the left, and sometimes to the right, so forming lines of serried chevrons framed, as it were, between grooves an inch, or an inch and a half, in width, by nine or ten feet in length.
"Manual Of Egyptian Archaeology And Guide To The Study Of Antiquities In Egypt"
Gaston Camille Charles Maspero