Sentence examples for geologic stages from inspiring English sources

Calibrations of a time scale must ultimately be based on the application of meaningful isotopic ages to the succession of polarity intervals and geologic stages.

As shown in the lower right part of the diagram, the shape of the hypsometric curve varies in early geologic stages of development of the watershed, but once a steady state (mature stage) is attained, tends to vary little thereafter, despite lowering relief.

In analysis, a curve is derived by plotting the relative height (h/H) and relative areas (a/A); the obtained curve is called as hypsometric curve (Suresh 1997).The shape of hypsometric curve varies in early geologic stages of development of the drainage basin, but once a steady state is attained it tends to vary little despite lowering relief (Kumar 1991; Suresh 1997).

Hiatus-bound packages are local stratigraphic intervals that record continuous marine deposition at a given temporal resolution, in this case geologic stages, and are bound above and below by stratigraphic hiatuses or intervals of non-marine deposition.

Jablonski [ 45] wrote that "For four of the Big Five mass extinctions of the Phanerozoic, the marine genera that survived the extinction suffered about 10 20% attrition in the immediately following geologic stage, significantly greater than the losses sustained in pre-extinction stages.

a Age of geological stage as defined in "A Geologic Time Scale" [39] (see text for details).

Several other important mineral deposits in the European Alpine system also can be related to the stages of geologic evolution described above.

The oldest surfaces of SPA are found to be oxygen-depleted during the heavy bombardment period relative to later stages of geologic development, followed by both an increase in silicon and oxygen, possibly due to ejecta sourced from outside of SPA, and subsequent modification due to mare basaltic volcanism, which increased iron and titanium within SPA.

In the nineteenth century, the long unwieldy geologic periods were subdivided into stages and ages respectively of rock and time.

In the nineteenth century, the long unwieldy geologic periods were subdivided into stages and ages — respectively of rock and time.

Much geochemical research is devoted to the quantification of this extraction of mantle material and its contribution to crustal growth throughout geologic time in the many stages of seafloor formation and mountain building.