Heinberg C.: The internal structure of the trace fossils Gyrochorte and Curvolithus.

An extremely mica-rich sandstone from the Lower Cretaceous of Milne Land, East Greenland has yielded new data on the internal construction of certain trace fossils. The sediment contains the following forms: Gyrochorte, Curvolithus, Siphonites, Planolites, and small endichnia. Mica orientation within Curvolithus and Gyrochorte permits a detailed analysis of the manner in which the animals burrowed in order to produce the characteristic back-fill structures. Weiss' interpretation of Gyrochorte as the burrow of a worm which progressed obliquely through the sediment, is supported on the basis of the internal structure.