[1] it is assumed that there were about 80 monoliths originally, but this has never been proven since only 43 remain The stones are estimated to weigh between 2 and 4 tons each. A new paper published in the journal of the geological society has lent support to recent theories about the origin of the mysterious ‘bluestones’ of stonehenge. The very large standing stones at stonehenge are of 'sarsen', a local sandstone, but the smaller ones, known as 'bluestones', come from the preseli hills in the pembrokeshire coast national park. Bluestones are believed to have been among the first stones erected at stonehenge about 5,000 years ago Boulders at stonehenge were taken to the monument's site by humans, rather than.
Stonehenge‘s bluestones are a collection of around 43 igneous rocks, including 27 spotted dolerites, 2 different types of rhyolite, a single example of calcareous ash, and 13 sandstones Estimates suggest there may have originally been closer to 80 or more bluestones erected at the site. Geologists have long known that 42 of stonehenge's smaller stones, known as 'bluestones', came from the preseli hills in pembrokeshire, west wales Now a new study published in antiquity pinpoints the exact locations of two of these quarries and reveals when and how the stones were quarried. Debris recovered from the aubrey holes, as well as various archaeological excavations at stonehenge and the stonehenge landscape, comprise spotted dolerite and more, and very different, dacitic and rhyolitic bluestone material. If the newall boulder is any indication, the builders of stonehenge had more than megaliths in mind
Pearson and his colleagues now posit that stonehenge was originally a circle of unworked bluestone, much of it quarried in wales, that was set up in pits at the site now known as the aubrey.
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