Leap Year Group

The type section of the Edlin Formation, which is laterally equivalent to parts of the Spurs Formation, is located 1 km north of Mt. Glasgow. The Edlin Formation is composed of fine-grained sandstone and mudstone containing lenticular bodies of oosparite limestone up to 5 m thick and less than 50 m long. It also contains tuff beds, conglomerate, and reddish-brown mudstones which contain probable mudcracks, indicating that the redbed sediment may have been exposed at the surface (Laird and Bradshaw 1983). 

The Eureka Formation at Eureka Spur consists of wavy-bedded sandstone, mudstone with lenses of limestone, and brownish-gray quartz sandstone. Minor mudstone layers interbedded with the sandstone con- 

Whole-rock K-Ar dates of slate and siltstones of the Mariner Group in Appendix 4.8.4.2, reported by Adams et al. (1982), range from 417 3 (Lower Devonian) to 380 3 Ma (Middle Devonian) and are lower than the age indicated by fossils (late Middle to late Late Cambrian), although they do overlap with the K-Ar dates of the Sledgers Group in Fig. 4.20. 

S-type granites, granodiorite containing hornblende and biotite, quartz monzonites, and alaskite (i.e., alkali-rich quartz-feldspar granite). The lithologic composition of the clasts indicates that volcanic and plutonic rocks were exposed to weathering and erosion a short distance from the site of deposition in the Bowers basin. 

The whole-rock K-Ar dates of two samples of slate and one of siltstone of the Leap Year Group in Appendix 4.S.4.3 range from 448 9 (Late Ordovician) to 421 3 Ma (Late Silurian) (Adams et al. 1982 Adams 2006). These dates shown Fig. 4.20 are also younger than the probable Cambrian depositional age of the rocks. 

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Bowers Mountains, Bowers Terrane Leap Year Group... 

Robertson Bay Group, Millen Range-Leap Year Glacier, K-Ar ... 

It is now almost exactly 50 years since I went as a postdoctoral fellow learn about cell culture in Harry Rubin s group in the Virus Laboratory at the University of California at Berkeley. The use of cell cultures had created the breakthroughs in quantitative animal virology, which led, inter alia, to the production of polio vaccines (albeit at the cost of the lives of hundreds of thousands of rhesus monkeys, whose kidney cells were used to produce the viruses for the vaccines). We worked on Rous sarcoma virus (RSV) and chicken leucosis viruses in chick embryo fibroblast cell cultures. Rubin and Temin had developed an assay for RSV, based on the production of foci of virus-transformed fibroblasts, and Temin did the crucial experiments which showed that RSV, an RNA virus, made a DNA copy of itself, which was used to produce new virus particles. The enzyme involved was reverse transcriptase, and its discovery was one of the most important leaps forward in cell and molecular biology. 

During these discussions we have leaped forward many years in the history of peptide chemistry. We discussed the situation after the invention of the Z-group by Bergmann and Zervas in 1932 and the continuation of peptide research first in Dresden then in New York. There the analysis of amino acids and peptides advanced rapidly and this led to the present high-performance chromatographic method of Stein and Moore. At the same time, with the work of Fruton, a... 

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