The Basic Eruptive Rocks of Gran. (A Preliminary Notice.)

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Abstract
I. Introduction Ever since the beginning of the present century, when the first pioneers in the geological exploration of Norway (Keilhau, Hausmann, Leopold von Buch, and Naumann) investigated the Christiania region, the igneous rocks of that district have been famous as being of more than common interest, as well from the many unique and remarkable rock-varieties as from the exceptionally instructive development of contact-metamorphism produced by the eruptions, and first brought to notice in this region through the observations of Keilhau, Naumann, and Kjerulf. In several preliminary communications on the igneous rocks of the Christiania region I have attempted to prove that all the numerous different masses of eruptive rocks within the sunken district between Lake Mö and the Langesundsfjord are geneticaly connected, and have followed eached other in a regular succession; the oldest rocks are the most basic, the youngest (except the unimportant basic dykes of diabase) are the most acid, and between the two extremes I have found a continuous series. Of late years I have proceeded in a more detailed manner with my investigations of the igneous rocks of the sunken tract of country in the Christiania region. I have not as yet in these studies discovered any facts in contradiction to my previously published observations and the deductions founded thereon. On the contrary, more detailed and minute investigation has only confirmed the correctness of former publications. I completed in the summer of 1893 a collection of observations for final publication on the oldest basic series of

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