DR PETER M. BORMAN, POROPERM-GEOCHEM LTD / SCIENCE PHOTO LIBRARY DR PETER M. BORMAN, POROPERM-GEOCHEM LTD / SCIENCE PHOTO LIBRARY
Polarised light micrograph of a thin section of a sedimentary limestone. The rock consists primarily of sea-shell fragments compacted together & then cemented with calcite. The wheel-shaped sediment at upper centre right is the spine of an Echinoid, a type of marine creature that lived in the Mesozoic & Cenozoic eras. This makes the rock up to 200 million years old, which is very young in geological terms. This micrograph is the first of a pair (with E415/072) demonstrating how the technique of cathodoluminescence can reveal fine details of rock structure. Ref: MICROCOSMOS, fig.
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