Granite Ridge Research Articles

Construction, Theory, and Application of Magnetic Field Balances

The paper describes the development and construction of magnetic field balances for measuring the vertical and horizontal intensity of earth magnetism. The main features of the theory are given and instructions to apply them. Success has been obtained with the instruments mainly over salt domes, iron-ore deposits, and igneous rocks such as granite ridges. Examples of such measurements are demonstrated. Literature.

Mississippi Lime West of the Granite Ridge in Kansas: GEOLOGICAL NOTES

Mississippi Lime West of the Granite Ridge in Kansas: GEOLOGICAL NOTES

Early Pennsylvanian Sediments West of the Nemaha Granite Ridge, Kansas: DISCUSSION

Early Pennsylvanian Sediments West of the Nemaha Granite Ridge, Kansas: DISCUSSION

The Origin of the Faults in Creek and Osage Counties, Oklahoma

The westward thrust of the Ozark uplift was opposed by the granite ridge of Kansas, causing rotational stresses in the formations lying between them. These rotational stresses caused shearing in directions approximately N. 25° E. and N. 65° W., and also tensional stresses in a northeast and southwest direction and compression in a northwest and southeast direction, as shown in the experiments of Mead. The conclusions are as follows: (1) The belts of short, en echelon, parallel faults were caused by horizontal movement along shear lines striking about N. 25° E. (2) The noses striking in a northwest direction were caused by shearing stresses along lines about N. 65° W., together with compression forces acting in a northwest-southeast direction. (3) The f lds striking in a northeast-southwest direction were caused by compression forces described above. (4) These phenomena are the result of rotational stresses between the Ozark uplift and the granite ridge of Kansas.

Professor Agassiz's South America Expedition

III. IN Mayne Harbour, on the western side of Owen's Islands, I had an opportunity of investigating two very interesting new genera of naked-eyed Acalephs. The locality naturali suggested appropriate names, and I called one after Captain Mayne Crossotoca Maynei, from the festooned disposition of the ovaries and the other after my old friend Owen, Staurotoca Owenii, from the cross-like figure of the ovaries. While I was collecting on board, Pourtales and Steindachner ascended the adjoining hills in search of glacial marks and land animals. The result of their excursion was most satisfactory. Pourtales found very well preserved glacial scratches and furrows upon wide greenstone dykes, which here intersected the rocks in every direction. Upon one such ledge the marks were divided into two distinct series, one running S. W. by W., the other crossing these S. S. W. Higher up on other dykes of the same character, the first series of marks occurred again, being perfectly rectilinear, in the same direction, and though in one instance interrupted, were renewed on the other side of the break on the same level with the same bearing. Still higher up on the same hillside he found also very distinct glacial furrows upon granite ridges, the furrows bearing S. W. by S., and finer lines again on greenstone dykes. The highest marks in the locality were some 500 or 600 feet above the sea level. Steindachner collected frogs and their tadpoles, and some insects and earthworms.