Carbonate minerals have precipitated from seawater for at least the last 3.8 billion years, but
changes in the physical and chemical properties of carbonate rocks demonstrate that the …

Geological evidence indicates that grounded ice sheets reached sea level at all latitudes
during two long-lived Cryogenian (58 and≥ 5 My) glaciations. Combined uranium-lead and …

Abstract The Cryogenian Period spans two major glaciations, the Sturtian Ice Age (~ 720–
660 Ma) and the Marinoan Ice Age (~ 650–635 Ma), the termination of each of which was …

Stromatolites are abundant in shallow marine sediments deposited before the evolution of
animals, but in the modern ocean they are restricted to locations where the activity of …

The primary mineralogy of marine carbonate precipitates has been a crucial factor in
constraining the major element composition of ancient oceans. Secular changes in …

Abstract The Una and Bambuí Groups of northeastern and central Brazil are remnants of a
vast intracratonic carbonate platform formed on the São Francisco Craton during the …

Ediacaran cap dolomites are strong evidence for the glaciation during the Neoproterozoic.
Stratigraphic-sedimentological studies combined with δ 13 C and δ 18 O isotope analyses …

Dropstones of ice-rafted origin are typically cited as key cold-climate evidence in
Cryogenian strata and, according to conventional wisdom, should not occur in postglacial …

Abstract The Luoquan Formation provides a record of the Ediacaran‐Cambrian glaciation in
the North China Craton. The sedimentary record is well expressed in the Henan Province …

Multiple intercalations of glacially derived and slope-derived diamictites testify to the
drawbacks of correlating Neoproterozoic diamictites more widely, but shed new light on the …