Cave and Karst Science, Vol.42, No.1, (2015) 42–53 © British Cave Research Association 2015 Transactions of the British Cave Research Association ISSN 1356-191X The caves of Giggleswick Scar – examples of deglacial speleogenesis? Phillip J MURPHY 1, Trevor L FAULKNER 2, Thomas C LORD 3, and John A THORP 4 1 School of Earth and Environment, University of Leeds, LS2 9JT, UK. e-mail:
[email protected] 2 Limestone Research Group, Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK. e-mail:
[email protected] 3 Lower Winskill, Langcliffe, Settle, BD24 9PZ, UK. e-mail:
[email protected] 4 5 Holme Park, High Bentham, Lancaster, LA2 7ND, UK. e-mail:
[email protected] Abstract: The prominent Giggleswick Scar at the South Craven Fault extremity of the Carboniferous limestone of the Askrigg Block in North Yorkshire, UK, contains relict phreatic caves whose speleogenesis is enigmatic. This paper examines the local geomorphological evidence and proposes that some, but not necessarily all, karst features along and above the Scar formed after the Last Glacial Maximum. Building on a previous deglacial model for the Yorkshire Dales, it is hypothesized that inception fractures and bedding plane partings were created during isostatic uplift. These were then likely enlarged by dissolution in cold unsaturated meltwater beneath a local flowing deglacial ice- dammed lake that formed initially at an altitude of c.300m, with a catchment area of c. 2km2. Rising cupolas outside Gully Cave were probably formed at c. 18ka BP by meltwater flowing up into a moulin within the ice, which continued to be cold-based farther south.