Recent borings in limestone cobbles from Marloes Bay, southwest Wales
Article first published online: 15 JUN 2007
Volume 40, Issue 3, pages 233–236, September 2007
How to Cite
DONOVAN, S. K., FEARNHEAD, F. E. and UNDERWOOD, C. J. (2007), Recent borings in limestone cobbles from Marloes Bay, southwest Wales. Lethaia, 40: 233–236. doi: 10.1111/j.1502-3931.2007.00020.x
- Issue published online: 15 JUN 2007
- Article first published online: 15 JUN 2007
- Manuscript received on 3/07/2006; manuscript accepted on 10/03/2007.
- composite ichnofossils;
Limestone clasts from the beach at Marloes Sands, southwest Wales, contain slender, straight to sinuous borings cross-cut by younger, clavate borings. The former were probably produced by sipunculids or polychaetes; the latter preserve shells of the boring bivalve Gastrochaena dubia (Pennant). Unusually, the calcareous linings of the clavate bivalve borings extend into many of the slender worm borings. Such linings are considered part of the hard parts of the producing bivalve, but the chance association of the two morphologies of borings has led to the lining becoming intimately associated with both of them. The modified linings of the bivalve borings have a similar morphology to the crypt of certain clavagellid bivalves, perhaps presenting an analogue for the morphology of a pre-clavagellid, boring ancestor.