Overthrust folds in detail on the southwestern border of the Vilcapampa batholith near Chuquibambilla.
Space was made for them by displacing the sedimentary cover and by a marked shortening of the sedimentary rim through such structures as overthrustfaults and folds.
In the long series of experiments conducted by Mr. Bailey Willis of the United States Geological Survey, all the stages between the overturned fold and the overthrust fold were reproduced.
In those regions where the beds have been folded and perhaps overthrust before their elevation into the zone of fracture, and which are further intersected by disorderly fissure planes, the results are far more complex.
The overthrust edge cracked lengthwise, this time west of the continental divide all the way from the Canadian line southward nearly to Marias Pass.
Perhaps thousands of years after the overthrust was accomplished another tremendous faulting still further modified the landscape of to-day.
Perhaps an inch of distance was an extraordinary advance for the Lewis Overthrust to make in any ordinary year, and doubtless there were lapses of centuries when no measurable advance was made.
This "overthrust belt" is represented by a number of small mountain ranges and high ridges formed by the "thrusting" of sedimentary rocks over other sedimentary rocks.
His elucidation of the geological structure demonstrated that certain anomalous occurrences of fossils were due to repeated interfoldings of the strata and to complicated overthrust faults.
Some, like Helm, will describe giganticoverthrust folds, and will draw immense arcs of circles several miles high in the air, as the place where the rocks must once have been.
Of course I am here taking the record just as I find it, as I have already discussed this matter of "overthrust folds.
And of an example described by Heim, already spoken of, he says: "One of the overthrust folds in the region has put the beds upside down over an area of 450 square miles.
Most noted of these residuals of overthrust masses is the Matterhorn, a mighty mountain without roots, a stranger in a foreign geologic environment.
Erosion has since carved up these overthrust sheets, leaving remnants lying on foundations which belong to a more northern portion of the ancient (early Tertiary) sea.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "overthrust" in a variety of sentences. We hope that you will now be able to make sentences using this word.
