Abstract
The paper is concerned with some key questions resulting from current studies of Triassic reefs and reef biota. A survey of the distribution of the reefs in time and space (Figs. 1–2) indicates the existence of Anisian buildups (starting in the Pelsonian), and significantly restricted to the southern part of Europe. Ladinian and Carnian reefs exhibit a larger distribution pattern, including Europe, Asia and western North America as well as Peru. Even broader is the distribution of Norian and Rhaetian reefs, which are known from many parts of the Tethys but have been studied in detail only in Europe, Central Asia and in western North America, The exact age of many Triassic reefs is controversial because of the strong facies control of reef biota. The composition of the framebuilding fauna (especially calcisponges and corals) can only differentiate an Anisian to Carnian time interval from a Late Upper Triassic interval.
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