Sketch by Richter (1926) showing spreite in a Diplocraterion parallelum burrow.
Diplocraterion is an ichnogenus describing vertical U-shaped burrows having a spreite (weblike construction) between the two limbs of the U. The spreite of fainter U-shaped traces appears above and below the final tunnel, made as the organism moved up and down through the sediment.Diplocraterion is the classic example of an "escape burrow", where the organism moves upward during high-sedimentation rates, creating spreite below it, in order to prevent the burrow entrance from being buried.
^Richter, Rudolf (1926). "Flachseebeobachtungen zur Paläontologie und Geologie. XII-XIV". Senckenbergiana8: p. 200–224.
^Fursich, F.T. (1974). "On Diplocraterion Torell 1870 and the significance of morphological features in vertical, spreiten-bearing, U-shaped trace fossils". Journal of Paleontology48 (5): 952–962. JSTOR1303293.
^Cornish, F.G. (1986). "The Trace-Fossil Diplocraterion: Evidence of Animal-Sediment Interactions in Cambrian Tidal Deposits". PALAIOS1 (5): 478–491. doi:10.2307/3514630. JSTOR3514630.