Excerpt from Conchology Section of the Auckland Institute and Museum: June 1977
Specimens of Limarl'a orientalis (a. Adams Reeve) are known from one Oligocene, six Miocene, five Pliocene, and more than 20 Pleistocene localities in New Zealand. Specimens are found mainly in shallow-water shellbeds, and in the extensive Wanganui coastal sequence they are recorded from only eight shellbeds and are not known from at least 25 intervening formations. Probably the discontinuous fossil record was caused by the infrequent preserva tion of near-shore environments during most of Tertiary time, and by a com bination of this and frequent extinctions and reinvasions during Pleistocene time.
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