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Updated: June 21, 2025
The dark crystalline rocks a at the bottom of the canyon are among the most ancient known, and are overlain unconformably by a mass of tilted coarse marine sandstones b, whose total thickness is not seen in the diagram and measures twelve thousand feet perpendicularly to the dip.
When this ended I passed over the northern heads of two small buttes which lie unconformably; the direction of their main axes lies north-north-west, whereas all their neighbours trend to the north-north-east.
Again, in the Wolds of Yorkshire the last- mentioned sandstone supports on its curved and inclined beds the horizontal Chalk. The Chalk again is vertical on the flanks of the Pyrenees, and the tertiary strata repose unconformably upon it.
The Tertiary strata of that age are seen on both sides of the Rhine, in the neighbourhood of Bonn, resting unconformably on highly inclined and vertical strata of Silurian and Devonian rocks. The Brown-Coal formation of that region consists of beds of loose sand, sandstone, and conglomerate, clay with nodules of clay-iron-stone, and occasionally silex.
"So perhaps," resumed my father, "and not unconformably with sacred records, from one great parent horde came all those various tribes, carrying with them the name of their beloved Asia; and whether they wandered north, south, or west, exalting their own emphatic designation of 'Children of the Land of Light' into the title of gods. "And why the deuce could not they?" asked Mr. Squills.
The early Cretaceous sea retired from Texas and Mexico, for its sediments are overlain unconformably by formations of the Upper Cretaceous. So long was the time gap between the two series that no species found in the one occurs in the other. THE UPPER CRETACEOUS. There now began one of the most remarkable events in all geological history, the great Cretaceous subsidence.
Dolomitic conglomerate. Near Bristol, in Somersetshire, and in other counties bordering the Severn, the lowest strata belonging to the Triassic series consist of a conglomerate or breccia resting unconformably upon the Old Red Sandstone, and on different members of the Carboniferous rocks, such as the Coal Measures, Millstone Grit, and Mountain Limestone.
The Ozark region was thus the first land to appear within the borders of the present state of Missouri." He further says: "Although it has long been known that the Magnesian Limestones are older than the Trenton, and that they lie immediately upon and against the Archæan crystallines unconformably, their exact geological age has always remained unsettled.
Here, therefore, it may truly be said that we are entering upon a new domain of life in our retrospective survey of the past. The Tremadoc slates are very local, and seem to be confined to a small part of North Wales; and Professor Ramsay supposes them to lie unconformably on the Lingula flags, and that a long interval of time elapsed between these formations.
The stratified beds, which we have hitherto followed across the range, a little further down are seen to lie, I believe unconformably, on a broad mountainous band of clay-slate and grauwacke.
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