What is "wenlock group"

Wenlock group \Wen"lock group`\, (Geol.) The middle subdivision of the Upper Silurian in Great Britain; -- so named from the typical locality in Shropshire.

The Wenlock Group (Wenlockian), in geology, is the middle series of strata in the Silurian (Upper Silurian) of Great Britain. This group in the typical area in the Welsh border counties contains the following formations: Much Wenlock Limestone Formation, 90–300 ft.; Wenlock Shale, up to 1900 ft.; Woolhope or Barr Limestone and shale, 150 ft.