They were particularly abundant during the Palaeozoic Era (248 to 545 million years ago), and are often the most common fossils in rock of that age. The brachipod Goniorhynchia boueti. Brachiopods are marine animals belonging to their own phylum, Brachiopoda, of the animal kingdom.
[ 2 syll. (c)hel-sea, ch-els-ea ] The baby girl name Chelsea is also used as a boy name, though it is far more popular for girls. It is pronounced as CH-EHLSiy- â . Chelsea is of Old English origin and it is used mainly in English. The name Chelsea means 'landing place for chalk or limestone'. It is derived from cealc which means 'chalk, limestone' ; hyth 'landing place, harbor'. The first name is from the district Chelsea in London.
Kelsey /kel-sey/ [2 sylls.] as a girls' name (also used less commonly as boys' name Kelsey) is pronounced KEL-see. It is of Old English origin, and the meaning of Kelsey is  victorious ship. Also possibly a place name referring to  island . Popular preference for Kelsey and its variants may be influenced by names like Chelsea and Casey.