We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Palaeoclimatology: Formation of Precambrian sediment ripples.
- Authors
Jerolmack, Douglas J.; Mohrig, David
- Abstract
Arising from: P. A. Allen & P. F. Hoffman 433, 123–127 (2005); Allen and Hoffman reply. Quantitative estimation of environmental properties using sedimentary structures preserved in rocks is complicated by the fact that some relationships between the fluid flow, sediment transport and bed topography are not unique. Allen and Hoffman propose that large, wave-generated sand ripples (orbital ripples) in Precambrian rocks were generated by sustained, extreme winds driven by rapid climate change after termination of the Marinoan glaciation. We show here that these features could equally well have formed under normal storm conditions in tens of metres of water. We therefore contend that the ripples do not provide direct evidence for a climatic transit after the break-up of a snowball-Earth's global ice cover.
- Subjects
PRECAMBRIAN stratigraphic geology; SEDIMENTARY structures; RIPPLE-marks; SEDIMENTOLOGY; CLIMATE change; EROSION; ACCLIMATIZATION; SEDIMENT transport
- Publication
Nature, 2005, Vol 436, Issue 7049, pE1
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/nature04025