Uranium thorium dating on corals

The Permian–Triassic extinction event is the most significant event for marine genera, with just over 50% (according to this source) failing to survive.

(source and image info) forming the boundary between the Permian and Triassic geologic periods, as well as the Paleozoic and Mesozoic eras.

alkaline - Term pertaining to a highly basic, as opposed to acidic, substance.

For example, hydroxide or carbonate of sodium or potassium.

Geology is the scientific study of the Earth, the materials of which it is made, the structure of those materials, and the processes acting upon them.

The Greek derivation of the word "geology" refers only to the Earth, but since the beginning of the space age, the field has expanded to include the study of the solid matter of other celestial bodies, such as Mars and the Moon.

For example, enter "giraffe" and you'll get back words like "gazellephant" and "gorilldebeest".

Enter "south america" and "chess" and you'll get back words like "checkuador".

Sustainability is possible by conserving energy, materials, resources, by new technologies, and by ensuring that the number of births is low enough so that there is enough to go around.For a while this "fungal spike" was used by some paleontologists to identify the Permian–Triassic boundary in rocks that are unsuitable for radiometric dating or lack suitable index fossils, but even the proposers of the fungal spike hypothesis pointed out that "fungal spikes" may have been a repeating phenomenon created by the post-extinction ecosystem in the earliest Triassic.The algae, which were misidentified as fungal spores, may even represent a transition to a lake-dominated Triassic world rather than an earliest Triassic zone of death and decay in some terrestrial fossil beds. 610-425 BC-Philosophers Thales, Anaximander, Pythagoras, Xenophanes and Herodotus propose that marine fossils found inland lived in the sea, and that the now dry land was once underwater. (The myth is probably inspired by remains.) 58 BC-Marcus Aemilius Scaurus displays the skeleton of the "monster of Joppa," said to have a 40-foot backbone and ribs taller than elephants. 13,000 BC-A sagacious rock-shelter resident at Arcy-sur-Cure, France, drills holes through a trilobite in order to wear it as an amulet.

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Geological analysis relies mainly on chemistry, physics and mathematics. a'a' lava - basaltic lava characterized by a rough or rubbly surface composed of broken lava blocks called clinker.

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