Booley Bay near Duncannon
West side of Hook Head
Late Cambrian Booley Bay formation is composed of fine grained sands and shales. These thin bedded fine quartz sands, silts and shales show small scale slumping and locally current ripples. The thickness of the beds varies randomly around one centimenter to around ten centimeters, locally reaching no more than twenty centimeters. beds have sharply defined continuous surfaces and these beds are thought to have collected below wave base. bedding planes show evidence of Ediacaran like Ichno Fossils occur as does elephant skin mottling which is thought related to microbial mat development. They show some evidence of Variscan structural deformation, including tight folding.
Tuesday, September 17, 2013