Abstract
MODERN stromatolites may be formed in certain environmental settings by several different processes and organisms1, although they are predominantly produced by blue-green algae. Algal stromatolites occur in the Lower Triassic Bunter formation (Buntsandstein) in the Krosno Odrzanskie region of western Poland. Spirorbid tubes often occur in the immediate vicinity of these stromatolites (Fig. 1), which are usually found unattached. Because spirorbid tubes are generally attached to submerged objects, mainly shells and pelagic and sedentary algae2, such unattached occurrences seem to indicate that the spirorbids lived on algae.
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