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Updated: May 11, 2025
This diagram shows the quadripartite arrangement of the primary septa, characteristic of palaeozoic corals, there being four principal and eight intermediate lamellae, the whole number in this type being always a multiple of four. c. Stauria astraeiformis, Milne Edwards. Young group, natural size. Upper Silurian, Gothland. Neozoic type of lamelliferous cup-shaped Coral.
In its most calcareous form the Mountain Limestone is destitute of land- plants, and is loaded with marine remains the greater part, indeed, of the rock being made up bodily of crinoids, corals, and bryozoa with interspersed mollusca. Palaeozoic type of lamelliferous cup-shaped Coral. Order ZOANTHARIA RUGOSA, Milne Edwards and Jules Haime. a.
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