This pattern is a tented arch of the upthrust type.
Figure 149 is a tented arch because of theupthrust present at the center of the pattern.
This pattern must be classified as a loop, as a dot may not be considered an upthrust unless elongated vertically.
This, however, is not necessary for a short upthrust or spike, or anyupthrust which rises perpendicularly.
Figure 330 is a plain arch as there is no upthrust (an upthrust must be an ending ridge), no backward looping turn, and no two ridges abutting upon each other at a sufficient angle.
The rising ridge at the center is curved at the top forming no angle, and does not constitute an upthrust because it is not an ending ridge.
Also, figure 121 is a plain arch approximating a tented arch as the rising ridge cannot be considered an upthrust because it is a continuous, and not an ending, ridge.
The ending ridge at the center cannot be considered an upthrust because it does not deviate from the general direction of flow of the ridges on either side.
The tented arch is directly beneath the innermost loop, and is of the upthrust type.
Figure 155 is a plain arch because it is readily seen that the apparent upthrust A is a continuation of the curving ridge B.
An upthrust is an ending ridge of any length rising at a sufficient degree from the horizontal plane; i.
The presence of the slightest upthrust at the center of the impression is enough to make a pattern a tented arch.
Beyond the lake a peakupthrust its rocky front into the sky.
There were slope fields strewn with black lava rock where never a solitary blade of grassupthrust a thin spear; there were broken expanses across which the eye might travel wearily for what appeared endless miles.
Brodie had just clambered up the ridge and came into view only when his head and bulky shoulders were upthrust beyond a boulder.
He slid off the boulder and, walking on a rock shelf that jutted out from the huge upthrust rock, examined the place very thoroughly.
Three hundred feet and more the ridge upthrust its barren crest, and the wagon road from the ranch crawled up over it in many switchbacks and sharp turns, using a mile and a half in the climbing.
The difference is caused by the great upthrust in the earth's crust, which detached Powell's Plateau from the Kaibab Plateau.
There were grim rock isles and islets beyond counting, dim snow-covered ranges beyond, and everywhere upstanding cliffs too steep for snow, outjuts of headlands, and pinnacles and slivers of rock upthrust from the boiling sea.
I remember, oh, long ago when human kind was very young, that I made me a snare and a pit with a pointed stake upthrust in the middle thereof, for the taking of Sabre-Tooth.
The surface on which the road lies is the same as that on top of the ledge; the land in the valley either dropped hundreds of feet or the plateau was upthrust an equal distance.
Beneath them was a blur of whirling white; ahead was an upthrust mountain range upon which they were driving.
Mr. Pennypacker leaned with an air of satisfaction against the upthrust bough of a fallen oak.
The two men were still sitting on the logs and leaning lazily against upthrust boughs.
His cabin, which was practically a citadel, stood on a steep cone of rock, upthrust from the bed of the wild little river which worked the mill.
In front, the cleared ground sloped away gently to the woods below, a snow-swathed, mystically glimmering expanse, its surface tumbled by the upthrust of the muffled stumps.
The inflated neck was arched from the center of the coil and the heart-shaped head, with red tongue out-thrust, waved slowly as the upthrust tail vibrated angrily.
I can show you places over there on the East wall of the Sierras where the mountains have been upthrust that way.
This tilting is connected with the upthrust of the Sierra Madre and the uplifting of the plateau country and the southern Rocky mountain region north of the international boundary.
The granitic mass is upthrust to form the nuclei of Sierra Madre and other considerable ranges; it also approaches the surface over large areas of plains.
At last he rounded an elbow of the steep, and there before him, upthrust perhaps a hundred feet above his head, stood the outlying shoulder of rock, crowned with its dead pine, on which he was accustomed to see the eagle sitting.
He came to a huge tree, blown down by the wind, but yet projecting above the snow, and sitting down on the trunk he leaned against an upthrust root.
Crouching, forgetful of our juxtaposition to these two unhuman, anomalous Things, we watched the play of the tentacles upon the upthrust rods.
Could it be that the impulses released by the Keeper's coilings passed through the Metal People of the pave on the upthrust Metal People of the crater rim who held the shields?
When his presence was announced, neither the cony nor I could see him because of an intervening upthrust of rock.
Then, thinking that I must be close to the spot from which the calls had come, I climbed an upthrust of rock, searched the openings among the trees near by, and listened intently.
Later, with the wind in my face, I peeped over a rocky upthrustnear a large snowbank.
Thus one day, with sunshine overhead and peaceful murmurs below, I stood upon a rock spire upthrust from the slope of Mount Chapin, watching a band of Bighorn sheep above timberline.
A band of mountain sheep started up from their shelter behind an upthrust rock and ran ahead of me.
The original shape of the upthrust was probably that of a huge dome, but the tooth of time has gnawed it into a score or more of clustered mountains rising eight and nine thousand feet above the level of the adjacent rivers.
The words should rise like a shaggy crag upthrust from the surface of silence, under the pressure of river power and yearning, contrition and wonder.
It sprang from the ruddy strand, leaped the crimson tide, and dropped three miles away upon a precipitous, jagged upthrust of rock frowning black from the lacquered depths.
Here, steadying themselves by upthrust branches, they turned and looked back, half apprehensive and half defiant, at their mighty pursuers.
They were skirting the very edge of it where it rose abruptly from the plain; a very great gray upthrust of granite wall beside them was like a gray blade slanted out of the plain.
