how did the red rocks form in sedona
Sedona, Arizona The famous red rocks of Sedona are formed by a layer of rock known as the Schnebly Hill Formation. The Schnebly Hill Formation is a thick layer of red to orange-colored sandstone found only in the Sedona vicinity. The sandstone, a member of the Supai Group, was deposited during the Permian Period.
Stonehenge Archaeological excavation has indicated that around 2600 BC, the builders abandoned timber in favour of stone and dug two concentric arrays of holes (the Q and R Holes) in the centre of the site. These stone sockets are only partly known (hence on present evidence are sometimes described as forming 'crescents'); however, they could be the remains of a double ring. Again, there is little firm dating evidence for this phase. The holes held up to 80 standing stones (shown blue on the plan), only 43 of which can be traced today. It is generally accepted that the bluestones (some of which are made of dolerite, an igneous rock), were transported by the builders from the Preseli Hills, 150 miles (240Â km) away in modern-day Pembrokeshire in Wales. Another theory is that they were brought much nearer to the site as glacial erratics by the Irish Sea Glacier[23] although there is no evidence of glacial deposition within southern central England.[24]