They found the spade in a ring gully, a type of circular trench that was probably used ... where organic remains like wood would disappear, they can become preserved for thousands of years ...

This course covers the OSHA Excavation Standard and safety and health aspects of excavation and trenching. Course topics include practical ... introduction of various types of shoring (wood timbers ...

This course covers the OSHA Excavation Standard and safety and health aspects of excavation and trenching. Course topics include practical ... introduction of various types of shoring (wood timbers ...