At the request of David Jennings, Opus International Consul tan ts Ltd, Hamil ton, we visited the Perry Aggregates quarry on River Road, Horotiu, on the morning of Wednesday 23 April 1997 to comment on the geoscientific context of the quarry. Our specific remarks relate only to observations made at the pit face at the present northwestern extremity of the quarry, which nevertheless are probably appropriate for the quarry as a whole. The quarry area inspected lies on a low terrace about 8 m above present-day river level (about 15 m a.s.l.) immediately adjacent to the Waikato River and covers an area of about 180 x 250 m centred on approximate grid reference S14 029885 (1:50 000 topographic map series NZMS 260).