Obs. or dial. (See quot.)
1836. J. Phillips, Illustr. Geol. Yorksh., II. 28. Croyl, or indurated clay with shells.
Hence, perhaps, † Croylstone, a name for native sulphate of barium; cawk.
1728. Woodward, Fossils, 18. Croyl-Stone, Craulgum, Crystalliz’d Cauk; likewise from the Peak Lead Mines. In this the Crystalls are very small.
