Spirorhaphe

of spiralling burrows.citation
author = Ekdale, A. A.
year = 1980
title = Graphoglyptid Burrows in Modern Deep-Sea Sediment
journal = Science
volume = 207
issue = 4428
pages = 304
doi = 10.1126/science.207.4428.304
url = http://www.sciencemag.org/cgi/content/abstract/sci;207/4428/304
pmid = 17739664] citation
author = Risk, M. J.; Tunnicliffe, V. J.
year = 1978
journal = Journal of Sedimentary Research
volume = 48
issue = 4
pages = 1287–1292
url = http://search.datapages.com/data/doi/10.1306/212F7662-2B24-11D7-8648000102C1865D
publisher = American Geological Institute.]

References