Demarkation in a sentence

The word "demarkation" in a example sentences. Learn the definition of demarkation and how to use it in a sentence.

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Definition of Demarkation

  • Same as Demarcation.

How to use demarkation in a sentence. Demarkation pronunciation.

In some parts of the globe, at the present period, the line of demarkation between distinct provinces of animals and plants is not very strongly marked, especially where the change is determined by temperature, as it is in seas extending from the temperate to the tropical zone, or from the temperate to the arctic regions.
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That gypsum has been selected by almost all Continental geologists as affording the best line of demarkation between the Middle and Lower Tertiary, or, in other words, between the Lower Miocene and Eocene formations.
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M. Bosquet, with whom I examined this formation (August, 1850), pointed out to me a layer of chalk from two to four inches thick, containing green earth and numerous encrinital stems, which forms the line of demarkation between the strata containing the fossils peculiar to Maestricht and the white chalk below.
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The lines of demarkation are not lines of disturbance, nor indicated by any striking physical characters or mineral changes.
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As this point has been selected as a line of demarkation for one of the three great divisions of the fossiliferous series, the student might naturally expect that by aid of lithological and palaeontological characters he would be able to recognise without difficulty a distinct break between the newer and older group.
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There is no clear line of demarkation between the Coal- measures and the Millstone Grit, nor between the Millstone Grit and underlying Yoredale rocks.
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By this arrangement the line of demarkation between the two great divisions, though confessedly arbitrary, is less so than by any other.
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To this, on its southern limit, succeeds a region equally extensive of syenite, the passage from the trappean to the crystalline Plutonic rock being so gradual that it is impossible to draw a line of demarkation between them.
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Examples of Demarkation

Example #1
It was once a favourite doctrine, and is still maintained by many, that these rocks owe their crystalline texture, their want of all signs of a mechanical origin, or of fossil contents, to a peculiar and nascent condition of the planet at the period of their formation.
Example #2
Here a gradual passage takes place from one set of species to another.
Example #3
Tin veins, age of, in Cornwall.
Example #4
I may observe, that the correlation of the French and English subdivisions here laid down is often a matter of great doubt and difficulty, notwithstanding their geographical proximity.
Example #5
The latter is distinguished by regular layers of black flint in nodules, and by several shells, such as Terebratula carnea (see Figure 246), wholly wanting in beds higher than the green band.
Example #6
Some of the organic remains, however, for which St. Peter's Mount is celebrated, occur both above and below that parting layer, and, among others, the great marine reptile called Mosasaurus (see Figure 227), a saurian supposed to have been 24 feet in length, of which the entire skull and a great part of the skeleton have been found.