Quaternary vegetation history of the Yellowstone Lake Basin. Fossil pollen and alga from Buckbean fen core. Yellowstone National Park, Wyoming. No date.

Album caption: Plate 4. Fossil pollen and alga from Buckbean fen core. x 1,054. Figure 1. 1a. High focus, to 1e, midfocus. Oxyria type pollen; 850-cm depth. Figure 2. 2a. High focus, to 2c, midfocus. Rumex pollen; 920-cm depth. Figure 3. 3a. Equatorial view. 3b. Polar view. Potentilla palustris pollen; 0-cm depth. Figure 4. 4a. High focus. 4b. Slightly lower focus. Populus pollen; 842-cm depth. Figure 5. 5a. High focus, to 5c, midfocus. Salix pollen; 900-cm depth. Figure 6. Pediastrum, a green alga; 920-cm depth. Index card: Late Quaternary vegetation history of the Yellowstone Lake basin. Yellowstone National Park, Wyoming. n.d. Published as Plates 1-10, U.S. Geological Survey. Professional Paper 729-E. 1976.