Murchison Field Environmental Baseline Study August 1978 Report on a pre-operational environmental appraisal of the benthos in the environs of the Murchison field, to establish a baseline for studies of the effects of petroleum-derived hydrocarbons in marine biota. Followed up and developed by a more detailed study in 1979. Report includes detailed text-based analysis illustrated by numerous data tables, diagrams and charts. Dec 1978