At noon the contact of the lava bed on the sandstone near Greenfield will be seen; here the lower surface of the lava is seen in cross section to be broken up into coarse fragments, now united by a sandy cement which is continuous with the sandstone below, and passes into a volcanic cement above, showing "where the slaggy surface of the flow was under rolled on a muddy bottom and the mud was forced up into the fissures," meeting in the cracks the still liquid lava from above.
The afternoon will be devoted to the study of the Bernardston series of Upper Devonian metamorphic rocks, and the contact of the Triassic sandstone, where it rests unconformable on the older rocks. The region is one of the most interesting, geologically, in New England, and we are especially privileged in having the opportunity to go with Professor Emerson as leader of the party, he having devoted many years to the study and geological mapping of the central portion of the state.
Intending members will confer a favor by sending in their names not later than Thursday, as it is necessary to engage barges in advance, at various points in the route. Address all communications to Mr. T. A. Jaggar, Room 6, M. C. Z., office hours, 9 to 10 a. m. daily. The total cost of the excursion will probably be about six dollars; the return will be on Saturday, arriving in Boston 8.45 p. m.