Geological levels

Usage examples of strata.

According to Moir, the triangular pieces of fossilized whale bone discovered in the strata below the Coralline Crag might have once been used as spear points.

What if, for example, fossils of anatomically modern humans turned up in strata older than those in which Dryopithecus were found?

As we shall see in Chapter 7, scientists of the nineteenth century made several discoveries of skeletal remains of anatomically modern human beings in strata of Pliocene age.

And in making such judgments, we also have to depend on reports concerning the chemical and other physical properties of the strata in which the fossil was allegedly found.

As we will see in the course of this book, investigators have sometimes observed artifacts in certain strata, but never reported this because they did not believe the artifacts could possibly be of that age.

Louis Bourgeois, a clergyman who had also earned a reputation as a distinguished paleontologist, carefully searched the strata at St.

But because Java man was found in Middle Pleistocene strata, the extensive evidence for tool-making hominids in the far earlier Pliocene and Miocene periods no longer received much serious attention.

But those free from such prejudices might wonder whether Warren had actually discovered, in the Eocene strata of Essex, a genuine implement.

They concluded that the flints from the base of the Red Crag near Ipswich were in undisturbed strata, at least Pliocene in age.

Furthermore, as described in Chapters 7 and 12, fossil skeletal remains of human beings of the fully modern type have been discovered by scientists in strata at least as old as the lower levels of Olduvai Gorge, Tanzania.

They had a patina similar in color to the rocks in the strata of which they formed a part.

Deeper in his pit, at a depth of about 14 feet in Early Miocene strata, Bourgeois discovered many flint tools.

I have personally extracted from the undisturbed strata at Puy de Boudieu many such unquestionable artifacts.

An unconformity is a lack of continuity in deposition between strata in contact with each other, corresponding to a period of nondeposition, weathering, or, as in this case, erosion.

On the basis of these two relatively inconsequential observations, Romero suggested that all the strata exposed in the barranca had been subjected to extreme dislocations.