Historical information
Core samples are cylindrical sections of a naturally-occurring substance, such as sediment or rock, that are obtained by drilling with a special drill and brought to the surface for examination. Core samples are used in underground or undersea exploration and prospecting. . The hole made for the core sample is called the "core hole"1.
Physical description
Colour photocopy of original photo. Four separate images of core samples. Core samples are placed side by side, lengthwise.
