The geologist Richard Dixon Oldham (1858 1936) published the second edition of Geology of India in 1892 for the Geological Survey of India. The work is a thoroughgoing revision of the first edition of the same manual compiled by H. M. Medlicott (1829 1905) and W. T. Blanford (1832 1905), published in 1879. It contains one of the earliest and most important geological surveys of India. Owing to an increase in available data since the first edition, descriptions of the rock formations of the country are arranged chronologically. This edition is particularly important for the data on, and...

Geologist and seismologist Richard Dixon Oldham (1858 1936) is best known for making two fundamental discoveries: in 1900 he identified primary, secondary and tertiary seismic waves, and in 1906 he presented evidence for the existence of the Earth's core. A fellow of the Royal Geographical Society, the Geological Society of London and the Royal Society, Oldham spent a large part of his career in Asia. Involved in the Geological Survey of India for twenty-five years, he played a key role in the development of geological research in the region (his revised Manual of the Geology in India is also...