(1) There is no evidence of the alignment of the Essequibo with the edge of a deep ocean basin.

(2) The Essequibo River is not a well-defined dividing line between two geological provinces.

(3) The Essequibo River does not mark the former locality of a coast line; it is not parallel to a tectonic depression.

(4) The “fault-line coast” criteria described are not restricted to the area west of the Essequibo, and even if they were, this would not necessarily be evidence of a tectonic break along die Essequibo.

There are a number of other controversial statements in the paper. I have attempted to deal only with the chief points raised in the four arguments referred to.