In the afternoon session, Hande- was taken on Green River sediment, interested me most. David White spoke of what he saw, and held that fresh- water algae played a part in it, and that the sediments were laid down under arid conditions. I sat up and added that the climate was rather cold and dry than warm and dry. Since no red beds and the preservation of carbonaceous materials. The idea that carbonaceous materials can only be preserved under the in- fluence of salt water may have to be abandoned. Under arid conditions salt is always present, but very little under cold dry conditions. After the meeting with Dr and Mrs R.F. Baker.