Sinkhole may exhibit a visible opening into a cave below. In the case of exceptionally large sinkholes, such as the Minyé sinkhole in Papua New Guinea or Cedar Sink at Mammoth Cave National Park in Kentucky, an underground stream or river may be visible across its bottom flowing from one side to the other. Sinkholes are common where the rock below the land surface is limestone or other carbonate rock, salt beds, or in other soluble rocks, such as gypsum, that can be dissolved naturally by circulating ground water. Sinkholes also occur in sandstone and quartzite terrains. As the rock dissolves,
Garrison A Cricket Ground Essex played Lancashire. Used by the Colchester Garrison today, the Army play matches there, with the last recorded match coming in 2008 when the Army played Huntingdonshire there. Garrison A Cricket Ground Garrison A Cricket Ground is a cricket ground in Colchester, Essex. The first recorded match on the ground was in 1924, when Essex played their first first-class match there against Gloucestershire. Essex played 25 first-class matches there between 1924 and 1972, playing their final first-class match there against Somerset in the 1972 County Championship. In addition, the ground has also hosted 2 List-A matches, the first of which