The other fissures have been destroyed by quarrying operations.
This suggests that the quarrying might have involved a process of splitting large exposed boulders and selecting appropriate blocks.
Shipping in aggregate is expensive and inconvenient; however, onsite quarrying and crushing is noisy, produces dust and creates a permanent scar on the landscape.
Pits dug for mundane purposes, such as quarrying, food storage, or water collection, may later serve ritual purposes, or vice versa.
The specific focus of that industry, whether the herring fishery, slate quarrying or the manufacture of linen, was a matter of opportunity.
This was accomplished by selecting digging situations that represent typical operating conditions for a wheel loader at mining, quarrying and construction sites.
Others of note are whisky distilling, granite quarrying, textile manufacturing, ship-building, engineering, food processing and paper manufacture.
The two sedimentary fills were undoubtedly continuous and the intermediate section was removed as a result of quarrying.
