We have gathered, from the nests of dinosaurs, and living and fossil birds, some evidence of the environment in which these creatures lived. However, our isotope determinations suggest it will be impossible to resolve the problem as to whether the dinosaurs were warm-or cold-blooded from the oxygen and carbon isotopes content of their shells.

No abstract

Bruderheim, a detonating bolide, fell at 1:06 a.m., MST, on March 4, 1960. The fireball traveled on an azimuth of N 100°, at a slope of 40°, with an initial atmospheric velocity of 8 to 10 miles per second. More than 300 kilograms have been recovered from the fall area, a well‐defined ellipse centered about latitude 53°54′N, longitude 112°53′W. This ellipse is 312 miles long and 214 miles wide (5.6 by 3.6 km), with its long axis N80W and the larger individuals located near its southeast apex.

Biotites occurring in igneous and metamorphic-metasomatic rocks have been critically studied. The study reveals a marked difference between the chemical composition of biotites from igneous rocks on one hand and those from metamorphic-metasomatic ones on the other. It is concluded that the chemical composition of a biotite reflects the environment of its formation as well as that of the rock containing it. The most frequently occurring ferromagnesian mineral in granites is biotite. As such it is thought that by processing the chemical data as suggested in this paper it should be possible to distinguish between granites formed by more than one mode of origin.

No abstract