[9] Chamberlin. Jour. of Geol., Vol. V, p. 795.
[10] A thoroughgoing study of the Formation of Sand Dunes (by V. Cornish) is to be found in the Geog. Jour., Vol. IX, 1897, pp. 278–309.
[11] Blanford. Geology of India, 2d ed., p. 455 et seq.
[12] Cornish, loc. cit.
[13] Cornish, loc. cit., p. 294.
[14] Diller states (17th Ann. Rept., U. S. Geol. Surv., Pt. I, p. 450) that on the coast of Oregon the slope of dunes is sometimes 40°.
[15] From folio preface, U. S. Geol. Surv.
[16] Credner. Elemente der Geologie, 6th ed., p. 271.
[17] Merrill. Rocks, Rock Weathering, and Soils, p. 295.
[18] Cowles. The Ecological Relations of the Vegetation of the Sand Dunes of Lake Michigan. Botanical Gazette, Vol. XXVII, 1899. An excellent study of the relations of sand dunes and vegetation.