The varieties of limestone are almost innumerable, but the great majority can be clearly proved to agree with chalk in being essentially of organic origin, and in being more or less largely composed of the remains of living beings.
We shall, however, afterwards see that some siliceous rocks are of organic origin.
Chemical examination shows that the ooze is composed almost wholly of carbonate of lime, and microscopical examination proves it to be of organic origin, and to be made up of the remains of living beings.
This view of the matter is further borne out by the fact that solids which have very large molecules (generally of organic origin) take on the colloidal form much more readily than do those of small molecular size.
He at first thought that crystalloids are always inorganic compounds, while colloids are of organic origin.
Each definite substance (barring those of organic origin) is called a mineral.
It is found interlaminated with gneiss, as carbonaceous and bituminous matters are found in the shales of the ordinary fossiliferous rocks, where these substances are known to be of organic origin.
Further, the graphite occurs in the way in which we should expect it to occur if of organic origin.
At that time, however, there was no question of a crural paraplegia of organic origin, since the man could move his legs well enough when in dorsal decubitus.
There was a left hemiparesis, apparently of organic origin, which had been determined as far back as July, 1915.
Hurst regarded this case as one of organic origin due to commotio spinalis.
The flints usually found in limestone are also of organic origin.
But of all rocks that have an organic origin, chalk is the most interesting.
We must now say a few words about those other aqueous rocks which have an organic origin, of which limestone is the chief.
So the matter remained till the Laurentian rocks of Canada, lying at the base of these old Azoic formations, afforded forms believed to be of organic origin.
There also occur in the same formation, graphite, iron ores, and metallic sulphides, in such relations as to suggest the idea that the limestones as well as these other minerals are of organic origin.
The form of this mineral was not suspected to be of organic origin.
Others, however, were evidently made up almost entirely of fragments of Eozoon, or of mixtures of these with other calcareous and carbonaceous fragments which afford more or less evidence of organic origin.
These are entirely of organic origin, and include two allied series, which are always merely the more or less extensively transformed tissues of plants or animals; viz.
Dolomite is a very much less abundant rock than limestone, and, unlike limestone, it rarely contains many fossils, and is never of organic origin; i.
He is on firmer ground in explaining the origin of chalk and clay, for the rocks of the region about Paris, with which he was familiar, are sedimentary and largely of organic origin.
He claims that the minerals and rocks composing the earth's crust are all of organic origin, including even granite.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "organic origin" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
