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List Of Stratigraphic Units And Structural Features In Massachusetts
This list includes stratigraphic units and structural geologic features in Massachusetts, grouped by age and by region within the state. Stratigraphic Units Eastern Massachusetts Proterozoic * Mattapan Volcanic Complex * Lynn Volcanic Complex * Middlesex Fells Volcanic Complex Cambrian * Hoppin Formation * Greenlodge Formation * Weymouth Formation Silurian-Devonian * Newbury Volcanic Complex Pennsylvanian (geology), Pennsylvanian (Late Carboniferous) * Bellingham Conglomerate * Narragansett Bay Group Structural Geologic Features Eastern Massachusetts Basins, Zones, Troughs & Blocks * Bellingham Basin * Boston Basin * Burlington mylonite zone * Middleton Basin * Nantucket Basin * Narragansett Basin * Nashoba Zone * Nashua trough * Newbury Volcanic Zone * Norfolk Basin Faults * Bloody Bluff fault * Clinton-Newbury fault References {{reflist Geologic formations of Massachusetts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proterozoic
The Proterozoic () is a geological eon spanning the time interval from 2500 to 538.8million years ago. It is the most recent part of the Precambrian "supereon". It is also the longest eon of the Earth's geologic time scale, and it is subdivided into three geologic eras (from oldest to youngest): the Paleoproterozoic, Mesoproterozoic, and Neoproterozoic. The Proterozoic covers the time from the appearance of oxygen in Earth's atmosphere to just before the proliferation of complex life (such as trilobites or corals) on the Earth. The name ''Proterozoic'' combines two forms of ultimately Greek origin: meaning 'former, earlier', and , 'of life'. The well-identified events of this eon were the transition to an oxygenated atmosphere during the Paleoproterozoic; the evolution of eukaryotes; several glaciations, which produced the hypothesized Snowball Earth during the Cryogenian Period in the late Neoproterozoic Era; and the Ediacaran Period (635 to 538.8 Ma) which is characterize ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |