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Seasonal Banding in the Alga Solenopora jurassica from the Middle Jurassic of Gloucestershire, England

V. Paul Wright
Journal of Paleontology
Vol. 59, No. 3 (May, 1985), pp. 721-732
Stable URL: http://www.jstor.org/stable/1304992
Page Count: 12
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Seasonal Banding in the Alga Solenopora jurassica from the Middle Jurassic of Gloucestershire, England
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Abstract

Solenopora jurassica from the Bathonian of Gloucestershire, England, displays regular alternating bands with well and poorly preserved perithallial cells. An analysis of cell sizes within the different bands suggests, by analogy with some living red algae, that they are of seasonal origin. The differences in preservation of the cell walls in the bands are interpreted as reflecting differences in diagenetic replacement mechanisms controlled by original differences in the magnesium content of the calcite in the walls. Characteristics used for specific and generic differentiation in the Solenoporaceae are shown to have high degrees of variability within single specimens.

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