The impact of selective logging (taking only some trees from a forest) can be seen in this view of the Tīhoi state forest in 1976. Above the logging road 55% of the timber has been removed, below it only 30% has been removed, while further down is an area of unlogged native forest. Between 1975 and 1984, when selective logging was the only type of harvesting permitted in native forests, the Forest Service carried out trials to see if the damage it caused could be reduced.