|
Alderley Edge in Cheshire is one of the classic locations for the study of Triassic sandstones in the United Kingdom. Numerous scientists from the early 19th century up to the present day have studied the area and it is a popular field site for universities around the UK. As time progresses, new theories are developed and new hypotheses are tested as to the origin of the sandstones. The information presented here provides the history and current (as of 2006) thoughts on the geological evolution of the sandstones at Alderley Edge. ==Nomenclature== The nomenclature of the English Triassic was rewritten in the 1980s〔( Permian and Triassic Stratigraphy )〕 and many of the previous names were changed. The classic terms ‘Bunter’ and ‘Keuper’ have now been abandoned, and the formations now recognized in the UK Triassic sequences, constitute three major lithostratigraphical units, * the Sherwood Sandstone Group (arenaceous siliciclastic) (equivalent to the Bunter and lower Keuper) * the Mercia Mudstone Group (argillaceous, halitic) (equivalent to the Keuper Marl) * the Penarth Group (not seen at Alderley).〔 〕 For this reason, in places, the older names with appropriate cross references are used, in order to maintain an understanding of earlier work. ''For a description of some of the other terms used see Geological unit'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Geology of Alderley Edge」の詳細全文を読む スポンサード リンク
|