Version 1.0.0 rev 43 -: 1 :- Version saved: 04 Apr 2019 at 23:15:00 A Description of the Mineralisation at Downrew Quarry, Bishop's Tawton, Devon. Alysson Rowan Devon, UK alyssonrowan@gmail.com https://independentscholar.academia.edu/AlyssonRowan Fig. 1. Downrew Quarry on the southern flank of Codden Hill. (Feb 2010) Sarah Charlesworth photograph [1] Abstract— Codden Hill is a major whaleback hill south east of Barnstaple in North Devon. It gives its name to a series of deep-water mud, silt and sandstones - the Codden Hill Cherts. These deposits are noted for their phosphate mineralisation, and especially for the presence of wavellite. Codden Hill, the largest in a series of similar hills, includes a number of small quarries which have not been well documented. This paper is intended to cover what may be the most interesting of these quarries.. Keywords— Codden Hill Cherts, phosphate mineralisation, cacoxenite I. INTRODUCTION Downrew Quarry is a small, privately owned quarry in the upper strata of the Codden Hill Cherts. It is owned and operated by a local farmer for dirt-road aggregate. The quarry has been mentioned in the past as a location where wavellite may be found but has since proved to be more complex than initially believed. A range of minerals has been identified at this location. These may be placed clearly within the geological context of the host strata. II. GENERAL DESCRIPTION The quarry lies about twenty metres to the north of an unclassified road which bounds the southern edge of Codden Hill, and is readily accessed on foot by a steep track up to quarry floor level. While the quarry floor is often wet, the depth of flooding is never more than a few inches; the threshold of the entrance is at quarry floor level. The main quarry floor is a bench surface about 2m above the threshold. There are two active faces to the north and to the east. The east face is a small, secondary bay close to surface level, the north face is a