A pollen profile of Otterbein bog, Warren county, Indiana

This paper is one of a series of similar analysis being made by the Botany Department of Butler University in a study of tree-pollen types from the peat bogs of Indiana. From this detailed study the forest types of Indiana succeeding the periods of glaciation to the present can be partially and fairly accurately reconstructed. The distribution and frequency of the plant life as determined from this study in turn serves as an index to the different climatic changes which followed the recession of the glacial periods. Indiana is particularly well adapted for this type of study. as the northern half of the State underwent three periods of glaciation, referred to as the Illinoian. the Early and the Late Wisconsin ice sheets, each of which left in its wake small lakes and kettle holes, some of which still remain as bodies of water and some of which have been completely filled or drained