The spillway excavation was designed to be located entirely in welded tuff and not to encroach on either the underlying non-welded tuff or the overlying sandstone, both of these rock types being much inferior to the welded tuff as a rock fill construction material.
32.
The spillway excavation was designed to be located entirely in welded tuff and not to encroach on either the underlying non-welded tuff or the overlying sandstone, both of these rock types being much inferior to the welded tuff as a rock fill construction material.
33.
The spillway excavation was designed to be located entirely in welded tuff and not to encroach on either the underlying non-welded tuff or the overlying sandstone, both of these rock types being much inferior to the welded tuff as a rock fill construction material.
34.
It was previously named the Hornblendic welded tuff and dated 15.83 ?0.44-14.22 ?0.33 million years ago; a younger date of 13.52 ?0.12 million years ago has been obtained on it.
35.
In Gadeb, Ethiopia, fragments of welded tuff that appeared to have been burned, or scorched, were found alongside " H . erectus " created Acheulean artifacts; but such re-firing of the rocks may have been caused by local volcanic activity.
36.
The sediments of the Uriconian are indicated to have been deposited rapidly with such volcanism being dated ( U-Pb Zircon ) at 566 + /-2Ma ( Note the Uriconian is cross-cut by the Late Precambrian Ercall Granophyre dated 560 + /-1Ma . ) The sequence is dominated by pyroclastic deposits, breccias and welded tuffs which is suggestive of a former volcanic centre being in close proximity and deposition in a subaerial environment.
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