Columbia Encyclopedia

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dating

(Encyclopedia)dating, the determination of the age of an object, of a natural phenomenon, or of a series of events. There are two basic types of dating methods, relative and absolute. In relative dating, the tempor...

apatite

(Encyclopedia)apatite ăpˈətīt [key], mineral, a phosphate of calcium containing chlorine or fluorine, or both, that is transparent to opaque in shades of green, brown, yellow, white, red, and purple. Apatite is...

Libby, Willard Frank

(Encyclopedia)Libby, Willard Frank, 1908–80, American chemist, b. Grand Valley, Colo., grad. Univ. of California (B.S., 1931; Ph.D., 1933). He taught (1933–45) at the Univ. of California and was a chemist (1941...

stratigraphy

(Encyclopedia)stratigraphy, branch of geology specifically concerned with the arrangement of layered rocks (see stratification). Stratigraphy is based on the law of superposition, which states that in a normal sequ...

geologic timescale

(Encyclopedia) CE5 geologic timescale, a chronological scale of earth's history used to measure the relative or absolute age of any part of geologic time. Of the numerous timescales, the most common is based on g...

Proverbs

(Encyclopedia)Proverbs, book of the Bible. It is a collection of sayings, many of them moral maxims, in no special order. The teaching is of a practical nature; it does not dwell on the salvation-historical traditi...

Clacton-on-Sea

(Encyclopedia)Clacton-on-Sea, town, Essex, E central England. It is a seaside resort situated on high cliffs. The Norman Church of St. John was restored there in 1865...
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