Middle North America Research Articles

Possible Continental Continuation of the Mendocino Fracture Zone

The Mendocino fracture zone may continue through or below North America near 40 degrees N latitude. This is suggested by instances of left-lateral movement, location of basin deeps, sedimentation patterns, interruption of a major magnetic anomaly, and inflection of major structural trends. A major segmentation of middle North America results.

The Tectonics of Middle North America. Philip B. King

<i>The Tectonics of Middle North America</i>. Philip B. King

The Tectonics of Middle North America: Middle North America East of the Cordilleran System

The Tectonics of Middle North America: Middle North America East of the Cordilleran System

Reviews and bibliography

King Philip B., The Tectonics of Middle North America, Princeton University Press, Princeton, N. J., 203 pp., 52 illus. in text, 1951. Whether he is engaged in prospecting or in the theoretical aspects of the physics of the Earth, the geophysicist must concern himself with the realities of geological structure. The prospecting geophysicist, whose immediate task refers to local detail of structure, must see it in the perspective of the larger regional picture to do it justice. For basic theory, a realistic comprehension of the facts on which the geologist's generalizations are based is fundamental. Unfortunately, the systematic synthesis of regional geological knowledge requires a combination of temperament, training, and freedom of action which is rare among geologists. Hence, critical syntheses lag far behind the growth of factual knowledge. The publication of a new competent summary such as Philip B. King's, The Tectonics of Middle North America, is therefore an important event.

Turtles and the origin of the fauna of Latin America

The study of the fossil and recent mammals and the turtles, to which this paper is specially devoted, of South and North America indicates the origin of the faunas and the paleogeographic conditions prevailing in South America. The continental Americas are divided into five zones from a zoogeographic viewpoint, Boreal North America, Middle North America, Southern North America (Central America and Mexico), Equatorial South America, and Austral South America. These five zones have fluctuated back and forth during Cenozoic history.

Production of Anti-Bacterial Agglutinins by Carp and Trout at 10 G

In recent years costly losses to the salmon industries and trout hatcheries of middle Europe, Great Britain, and North America have been caused by a generalized bacteremia, the etiological agent of which is Bacterium salmonicida. These losses have raised the question as to the possibility of inducing immunity in brood stocks of these species by the use of bacterial vaccines.There is no physiological characteristic of fish, amphibians, or reptiles known to the author that indicates that the reaction of these animals to the injection of a bacterial vaccine should differ from the response of the warm blooded vertebrates. Nevertheless, a search of the literature has failed to reveal a single attempt to immunize fish with vaccines. Indeed, there are very few studies reporting the production of any antibodies by cold-blooded animals upon the injection of foreign proteins, and most of these reports concern animals held at 20°C or above.Five studies report the production of antibodies against red blood cells. Laz...