Along Alhambra Creek at Escobar Street in 1998, runoff eroded the stream bank revealing fresh, unweathered sand and silt about thick, probably reflecting gold rush era sedimentation.
22.
Young, fresh craters have bright ray systems, because they have exposed fresh, unweathered material, but over time those rays disappear as the weathering process darkens the material.
23.
It can take one minute to create a 12 mm deep cupule on weathered sandstone, but 45, 000 and 60, 000 hammer-stone strokes on unweathered quartzite.
24.
The resulting fresh rock face is visible a long way off and is called the " Wei�e Wand " ( " White Wall " ) on account of its light-coloured, relatively unweathered surface.
25.
The unweathered appearance of the archways led to a public debate between 19th century commentators as to whether the archways had been rebuilt since the 12th century, but the prevailing view, as argued in the 19th century by George Edmund Street, is that they are probably the original ones.
26.
Sculptured pediments were added to temples, including the Parthenon in Athens, where the remains of the pediment of around 520 using figures in the round were fortunately used as infill for new buildings after the Persian sack in 480 BCE, and recovered from the 1880s on in fresh unweathered condition.
27.
For in LA, as in Phoenix, any building older than our high-school years tends to be flattened and replaced with one of those brittle, obdurate, unweathered and machine-edged monoliths, too juvenile to know better, too inexperienced to have the wisdom time brings to sandstone and concrete.
28.
As the fossil fragments were composed of calcium carbonate, which is the mineral that forms limestone, the iron ore beds at depth, where they are unweathered and where there has been no condition that permitted leaching of the lime content, carry a considerable percentage of lime, so that the ore is self-fluxing.
29.
Neither Vogel nor Hesse mention Krakatoa in any real detail in their other passages, and no other travelers at the time mention an eruption or evidence of one . ( In November 1681, a pepper crop was being offered for sale by inhabitants . ) In 1880, Verbeek investigated a fresh unweathered lava flow at the northern coast of Perboewatan, which could not have been more than two centuries old.
