stromatolite वाक्य
उदाहरण वाक्य
मोबाइल
- In August 2016, an Australia-based research team presented evidence that the Isua Greenstone Belt contains the remains of stromatolite microbial colonies that formed approximately 3.7 billion years ago.
- The discovery of complex stromatolite structures at Isua, formed from accreted biofilm layers so early in the history of the Earth suggests that life first evolved on Earth over 4 billion years ago.
- As a result, he added, " we need to take a fresh look at the processes of stromatolite morphogenesis to seek more convincing measures of biogenicity than are currently available ."
- The stromatolite fossils appear wavy and dome-shaped, are typically high, and were found in iron-and magnesium-rich dolomite sedimentary rocks that had recently been exposed by melting snow.
- It consists of some of the oldest reef systems built by a community of organisms rather than the deposit of a limited range of similar organisms, such as Stromatolite mounds deposited by ancient cyanobacteria.
- Grotzinger, J . P ., Watters, W . and Knoll, A . H ., 2000, Calcified metazoans in thrombolite-stromatolite reefs of the terminal Proterozoic Nama Group, Namibia.
- A stromatolite colony was reportedly found at the Giants Causeway in October 2011 an unusual find, as stromatolites are more commonly found in warmer waters with higher saline content than that found at the causeway.
- Among his many works, James Hall identified that stromatolite fossils discovered at Petrified Sea Gardens, a site near Saratoga Springs, New York that is now also a National Historic Landmark, were originally organic.
- The ore minerals of the Lead Belt are primarily hosted by bacterial stromatolite reefs and associated Pennsylvanian and / or Permian periods when warm metal and petroleum bearing fluids from adjacent sedimentary basins migrated through these rocks.
- In the late Archaean eon, an oxygen-containing atmosphere began to develop, apparently from photosynthesizing cyanobacteria ( see Great Oxygenation Event ) which have been found as stromatolite fossils from 2.7 billion years ago.
- Very fine particles of solids i . e . sand, crushed shell etc . are trapped by the sticky bacteria, to become cemented with calcium carbonate produced by the bacteria, thereby building up the stromatolite structures.
- According to these specimens, species of " Holonema " lived by grazing on stony, horn-shaped, stromatolite-like algae called oncholite, apparently by snipping off the points with a specialized snout.
- In the late Archean Eon an oxygen-containing atmosphere began to develop, apparently produced by photosynthesizing cyanobacteria ( see Great Oxygenation Event ), which have been found as stromatolite fossils from 2.7 billion years ago.
- There are three basic types of Stromatolite, the sub-tidal ( always under water ) columns and the inter-tidal ( exposed to air and sun during low tides ) anvil or mushroom shapes depicted in most pictures.
- In the journal article, the scientists said this strictly nonbiological dynamical model of stromatolite surface growth " calls into question the assumption that organisms _ even if present _ necessarily played an essential role in determining stromatolite morphology ."
- In the journal article, the scientists said this strictly nonbiological dynamical model of stromatolite surface growth " calls into question the assumption that organisms _ even if present _ necessarily played an essential role in determining stromatolite morphology ."
- Applying the principles of fractal geometry, they could begin to deduce the processes of stromatolite growth, which involved calcium carbonate suspended in water falling to the sea or lake floor, some downslope movement and rearrangement of sediments and other factors.
- During the beginning of the Tonian period around 1 billion years ago, there was a decrease in Stromatolite diversity, which may indicate the appearance of grazing animals, since stromatolite diversity increased when grazing animals became extinct at the End Ordovician extinction events, and decreased shortly after the grazer populations recovered.
- During the beginning of the Tonian period around 1 billion years ago, there was a decrease in Stromatolite diversity, which may indicate the appearance of grazing animals, since stromatolite diversity increased when grazing animals became extinct at the End Ordovician extinction events, and decreased shortly after the grazer populations recovered.
- There are various different micro-organisms that can create them ( generally, the fossil record only preserves the stromatolite, not the bacteria that created it, so it's hard to tell precisely what made them ), but I not sure whether any of them are in our line of descendants.
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