R. I. Murchison and H. E. Strickland. 1837. On the upper formations of the New Red System in Gloucestershire, Worcestershire, and Warwickshire; showing that the Red or Saliferous, including a peculiar band of sandstone, represent the "Keuper" or "Marnes irisées;" with some account of the underlying sandstone of Ombersley, Bromsgrove, and Warwick, priving that it is the "Bunter Sandstein" or "Grès bigarré" of foreign geologists. Transactions of the Geological Society of London, series 2 5(26):331-348 [M. Carrano/M. Carrano]