. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE No. 142 Contribution from the Bureau of Soils, Milton Whitney, Chief December 29, THE MIAMI SERIES OF SOILS. By J. A. Bonsteel, Scientist in the Soil Survey. INTRODUCTION. The Miami series comprises an important group of soils which are distinguished by prevailing brown, light-brown, or gray surface soils and yellowish-brown or darker brown subsoils. In the heavier mem- bers of the series, especially where the natural drainage is not com- plete, the deeper subsoils are mottled with shades of brow
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE No. 142 Contribution from the Bureau of Soils, Milton Whitney, Chief December 29, THE MIAMI SERIES OF SOILS. By J. A. Bonsteel, Scientist in the Soil Survey. INTRODUCTION. The Miami series comprises an important group of soils which are distinguished by prevailing brown, light-brown, or gray surface soils and yellowish-brown or darker brown subsoils. In the heavier mem- bers of the series, especially where the natural drainage is not com- plete, the deeper subsoils are mottled with shades of brown and gray. The topography of the different members of the series ranges from nearly level or only gently undulating to more rolling and ridged. Locally, sharply sloping ridges and small areas in which erosion has developed a choppy surface are encountered. By far the greater part of the area occupied by the important types of the series is best described as gently undulating to moderately rolling. The natural drainage over a large part of the territory occupied by this series is fair to good. In the more nearly level tracts, par- ticularly of the heavier soils, artificial underdrainage is highly beneficial. In its original condition practically the entire extent of territory occupied by the soils of this series was heavily forested with hard- woods. Beech was the dominant growth on the more nearly level tracts, while sugar maple was most commonly found in the more rolling and better drained areas. Associated with these trees were walnut, several species of oak, basswood, and elm and ash, the two latter in areas where drainage was markedly deficient. The soils of the Miami series are all derived from a thick sheet of glacial drift which covers the general region of their occurrence, extending to depths varying from a few feet to more than 350 feet. The deeper subsoils of the Miami series are generally calcareous to a varying degree, but it is a common characteristic of practica
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