Uranium thorium dating on corals


01-Nov-2017 12:39

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.

Galen will establish the concept of humors (phlegm, blood, black bile and yellow bile) that determine both health and personality.

Belief in these four humors will dominate medicine and biology for many centuries. 180-Pausanias records a description of the skeleton of the hero Ajax.

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.

Port Manteaux churns out silly new words when you feed it an idea or two.

Enter a word (or two) above and you'll get back a bunch of portmanteaux created by jamming together words that are conceptually related to your inputs.

Enter "south america" and "chess" and you'll get back words like "checkuador".It is the Earth's most severe known extinction event, with up to 96% of all marine species and a runaway greenhouse effect triggered by sudden release of methane from the sea floor due to methane clathrate dissociation according to the clathrate gun hypothesis or methane-producing microbes known as methanogens; However, it is now possible to date the extinction with millennial precision.U–Pb zircon dates from five volcanic ash beds from the Global Stratotype Section and Point for the Permian–Triassic boundary at Meishan, China, establish a high-resolution age model for the extinction – allowing exploration of the links between global environmental perturbation, carbon cycle disruption, mass extinction, and recovery at millennial timescales.aeolian process - A geological modification, such as sand dunes or erosion, caused by wind activity. algal mat - A layered communal growth of algae observed in fossils and in present day tidal zones associated with carbonate sedimentation.

alkali metal - A strongly basic metal like potassium or sodium.

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