By Institution of Railway Signal Engineers (IRSE)
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Extra resources for IRSE Green Book No.25 Level Crossing Protection 1961
Base saturation is a measurement of the percentage of a soil’s cation exchange capacity (negatively charged edges) that is occupied by the base cations Ca2+, Mg2+, Na+, and K+. Ultisols predominate over metasedimentary rocks and felsic intrusions. A second well-developed soil order, the Alfisols, consists of intermediately weathered soils with high base saturation; Alfisols are typically mapped over mafic and ultra-mafic parent materials, such as gabbro and diabase (Genthner, 1990), as will be seen at Stop 6.
The Fishing Creek Metabasalt is pervaded by a welldeveloped foliation, S1, which parallels the layering and laminations. This foliation is quite planar and flat, only gently and broadly undulose on a 2–4 m scale. However, the foliation does bend (refract) around epidote and quartz knots, probably in response to the growth of the knots after S1 developed. The foliation is so well developed that the metabasalt frequently tends to split into thin (1–8 mm) slabs on weathered surfaces. This foliation dips moderately to the southeast, 063–56.
1970, The Tectonics of the Appalachians: New York, Wiley Interscience, 271 p. , 1982, Growth of ultramafic reaction zones in greenschist to amphibolite facies metamorphism: American Journal of Science, v. 282, p. 543–616. , The Nature of Magmatism in the Appalachian Orogen: Geological Society of America Memoir 191, p. , II, 1993, Tell-tale talcs—Chemical clues to unravel the Earth’s secrets: Pacific Geology, v. 24, no. 1, p. 2–6. , II, 1994, Bald Friar Metabasalt and geochemistry of ultramafic fragments, in Stop 14.
IRSE Green Book No.25 Level Crossing Protection 1961 by Institution of Railway Signal Engineers (IRSE)