Mulde event
Encyclopedia
The Mulde event was a secundo-secundo event, and marked the second of three relatively minor mass extinctions during the Silurian
period. It coincided with a global drop in sea level, and is closely followed by an excursion in geochemical
isotope
s. Its onset is synchronous with the deposition of the Fröel formation in Gotland
.
Silurian
The Silurian is a geologic period and system that extends from the end of the Ordovician Period, about 443.7 ± 1.5 Mya , to the beginning of the Devonian Period, about 416.0 ± 2.8 Mya . As with other geologic periods, the rock beds that define the period's start and end are well identified, but the...
period. It coincided with a global drop in sea level, and is closely followed by an excursion in geochemical
Geochemistry
The field of geochemistry involves study of the chemical composition of the Earth and other planets, chemical processes and reactions that govern the composition of rocks, water, and soils, and the cycles of matter and energy that transport the Earth's chemical components in time and space, and...
isotope
Isotope
Isotopes are variants of atoms of a particular chemical element, which have differing numbers of neutrons. Atoms of a particular element by definition must contain the same number of protons but may have a distinct number of neutrons which differs from atom to atom, without changing the designation...
s. Its onset is synchronous with the deposition of the Fröel formation in Gotland
Gotland
Gotland is a county, province, municipality and diocese of Sweden; it is Sweden's largest island and the largest island in the Baltic Sea. At 3,140 square kilometers in area, the region makes up less than one percent of Sweden's total land area...
.