Much further research into the origin of the bluestones has been published between 20 particularly by geologists Richard Bevins and Rob Ixer. In 2018 a book devoted specifically to the problem of bluestone provenance and transport concluded that the Stonehenge bluestones are essentially an ill-sorted assemblage of glacial erratics. The majority of them are believed to have come from the Preseli Hills, about 250 kilometres (150 miles) away in Wales, either through glaciation ( glacial erratic theory) or through humans organizing their transportation.Ī summary of the major aspects of the Stonehenge "bluestone conundrum" was published in 2008. The stones are estimated to weigh between 2 and 4 tons each. It is assumed that there were about 80 monoliths originally, but this has never been proven since only 43 remain. The bluestones at Stonehenge were first used there during the third phase of construction at Stonehenge around 2300 BC. Many of them appear to have been made in or near Stonehenge, since there are petrographic similarities with some of the spotted dolerites there. Preseli bluestone tools, such as axes, have been discovered elsewhere within the British Isles. It is a medium grained dark and heavy rock, harder than granite. One of the most common rocks in the assemblage is known as Preseli Spotted Dolerite-a chemically altered igneous rock containing spots or clusters of secondary minerals replacing plagioclase feldspar. It is a "convenience" label rather than a geological term, since at least 46 different rock types are represented. The term "bluestone" in Britain is used in a loose sense to cover all of the "foreign," not intrinsic, stones and rock debris at Stonehenge.
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