(Guyana Graphic September 6, 1970)
A new booklet written by former expatriate staff members of the Geological Surveys Department has disclosed that radiometric tests in the Barama-Mazaruni area show that some of the rocks there are over 2,500 million years old.Others in the Roraima area believed to the source of river bed deposits and diamonds, have been dated as originating 2000 million years ago before the period when the sea invaded Guyana and reached as far as the foot of the Pakaraimas.
These disclosures are contained in the booklet: “The folded Precambrian of northern Guyana related to the Guiana shield” written by Dr. E. Williams, Dr. R.T. Cannon and Dr. R.B. McConnell who were formerly attached to the Geological Survey Department but are now in various parts of the world.
The booklet which contains a series of geological studies, and was recently published is available at the Ministry of Information which said that it was written as a follow-up to the Provisional Geological Map published in 1962.
The Ministry said thatit was intended to set out the facts on which the authors based their conclusions concerning their interpretations of the Guiana Shield area.