|
Svanbergfjellet Formation
The Svanbergfjellet Formation is a Formation (geology), geologic formation in Svalbard. It preserves eukaryotic fossils dating back to the Late Tonian Period (geology), period, around 790 Ma. Paleobiota After Butterfield et al, 1994. References {{reflist Geologic formations of Norway Tonian Neoproterozoic geology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (stratigraphy)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness (geology), thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obruchevella
''Obruchevella'' is a helical microfossil known from the Burgess Shale and Cambrian sites in China, as well as later sites dating to as late as the Devonian. It is also known from Owk shales, Vindhyas, Tal Formations, Russia, Greenland, Saudi Arabia, Canada, Alaska and so on. References {{Taxonbar, from=Q7075371 Cambrian bacteria Ordovician bacteria Silurian bacteria Devonian bacteria Burgess Shale fossils ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leiosphaeridia
''Leiosphaeridia'' is an extinct genus of acritarchs. Around 50 species are known, ranging from the Statherian The Statherian Period (; , meaning "stable, firm") is the final geologic period in the Paleoproterozoic Era and lasted from Mya to Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. Th ... of Australia seemingly to the present. See also * Leiosphaerid References {{Taxonbar, from=Q6520099 Acritarch genera Proterozoic life Phanerozoic life ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
