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T.J. Gipple's stone quarry, near NRHP-listed Gipple's Quarry Bridge (1893), Columbus Junction, Iowa; Old State Quarry, North Liberty, Iowa, NRHP-listed; Quarry, Iowa, site of limestone quarrying in Marshall County, Iowa. Town was laid out by Le Grand Quarry Company in 1868. Nearby Quarry Bridge, in Marshalltown, Iowa, is NRHP-listed.
Slate can be made into roofing slate, a type of roof tile which are installed by a slater. Slate has two lines of breakability—cleavage and grain—which make it possible to split the stone into thin sheets. When broken, slate retains a natural appearance while remaining relatively flat and easy to stack.
Researchers at McGill University found a rock with a very old model age for extraction from the mantle (3.8 to 4.28 billion years ago) in the Nuvvuagittuq greenstone belt on the coast of Hudson Bay, in northern Quebec; [2] the true age of these samples is still under debate, and they may actually be closer to 3.8 billion years old. [3]
The holes are typically 1 ⁄ 4" to 3 ⁄ 4" in diameter and extend through a raised portion centered in the stone. They usually are bored all the way through but some have been found with holes that extend only part of the way through. Many are made from banded slate or other colored hard stone.
Collyweston stone slate is a sedimentary limestone from the Jurassic period, approximately 140–190 million years old. Unlike metamorphic slate, this limestone naturally splits along its bedding planes, making it suitable for roofing. The material is named after the village of Collyweston, situated centrally within the quarrying area.
It contained a broken ceramic pot, which has since been lost, and was buried under layers of stone rubble. [6] The recovered portion of the slab measured 2.2 metres (7.2 ft) long, 1.53 metres (5.0 ft) wide and 0.16 metres (0.52 ft) thick and weighed around 1 tonne (1 long ton).
Llech Ronw, or the Slate of Gronw, is a holed stone located along Afon Bryn Saeth (a tributary of Afon Cynfal) in Blaenau Ffestiniog, Wales. The stone is described as being roughly forty inches by thirty inches with a hole of about an inch in diameter going through it.
A farmhouse and farm buildings that were later altered. They are in sandstone, partly rendered, and have a Kerridge stone-slate roof. The farmhouse has an L-shaped plan, is in two storeys, and has a west front of three bays with two gables. The central doorway has a segmental head and a triangular pediment containing initials. To the right is a ...