Long Hills

The dates derived from the basement rocks of the Wiseonsin Range in Table 7.2 outline a hypothetical geological history for this segment of the Transantaretie 

Mountains that is illustrated in Fig. 7.17. The results generally eonfirm the master hypothesis eoneerning the origin of the Ross orogen presented by Stump (1995). 

The Long Hills in Fig. 7.18 eonsist of a small eluster of nunataks loeated about 45 km east of Mt. LeSehaek at the eastern limit of the main body of the Wiseonsin 

The dates and initial Sr/ Sr ratios were recalculated for this presentation by unweighted linear regression 

Concentrations of Rb and Sr in whole-rock samples were measured by x-ray fluorescence using pressed pellets prepared from powdered samples (Eastin 1970 Ray 1973) 

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When the liquid/solid interface is unstable according to the criteria discussed in Section 20.3.3, a cellular or dendritic structure is developed. When the degree of instability is relatively low, an array of protuberances develops on the interface as shown in Fig. 20.8a. These protuberances, called cells, advance perpendicular to the interface. Their shapes vary depending upon the type of material, the orientation of the interface, and other factors. For (100) liquid/solid interfaces in cubic metals, equiaxed cells form like those in Fig. 20.86. However, for a (110) interface, the cells take on a corrugated configuration of long hills and furrows. When the degree of... 

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An improvement on the simple steepest descent method was made by Schleyer (Engler et al., 1973), and utilized the pattern search procedure. In this case the method proceeds as before, but information regarding the direction of motion of the atoms is saved from one iteration to the next, and the correction terms for succeeding motions are summed, and then applied. The advantage of this method is that if a particular atom is moving down a long hill with small slope, while the steepest descent method requires many iterations to move it, the pattern search method accelerates the motion, because the motion is repeatedly in the same direction, and the size of the correction term increases. 

Fig. 7.4 The geology of the Wisconsin Range and of the Long Hills is dominated by the Granite Harbor Intrusives of the Wisconsin Range Batholith. These granitic rocks intruded the metasedimentary rocks of the LaGorce Formation and the metavolcanic rocks of the Wyatt Formation, both of which also...

The granitic basement rocks of the Wisconsin Range Batholith are the dominant lithology in the Quartz Hills and Caloplaca Hills west of Reedy Glacier (Fig. 7.4). They also form the main part of the exposed basement rocks east of the Reedy Glacier and extend east as far as the Long Hills. These granitic basement... 

Table 7.2 Summary of Rb-Sr dates of whole-rocks and mineral concentrates from the basement rocks of the Wisconsin Range and the Long Hills in the Horlick Mountains. Recalculated to X ( Rb) = 1.42 x 10 year from unpublished analytical data by Faure et al.

Range. The principal nunataks are Peters Butte (2,130 m), Todd Ridge (2,190 m), Victor Cliff (2,160 m), and Knack Point. In addition, Spencer Nunatak (2,007 m) and Widich Nunatak (1,986 m), which are not included in Fig. 7.18, occur along the ice-covered escarpment that extends east from Mt. LeSchack to the Long Hills. 

Fig. 7.19 Silica-variation diagram of rhyolite pyroclastic rocks on Todd Ridge of the Long Hills, Horlick Mountains. One sample of rhyolite from Mt. Webster in the Harold Byrd Mountains is represented by the x (Data from Minshew 1967 Faure unpublished in Appendix 7.8.3)...

The Ohio Range is located about 55 km northeast of the Long Hills and forms the most easterly part of the Horlick Mountains. The topographic map in Fig. 7.21... 

Fig. 7.20 Whole-rock Rb-Sr age determination of rhyolite pyroclastics in the basement complex of the Long Hills (Data from Faure unpublished in Appendix 7.8.4)...

Quartz Monzonite, Todd Ridge and Peters Butte, Long Hills ... 

A Todd Ridge, Long Hills (F-64-128,2) B Todd Ridge, Long HiUs (F-64-128,4) C Todd Ridge, Long Hills (F-64-128,10) D Mt. Webster, Harold Byrd Mtns ( 228) Analyses by A.S. McCreath and Son, Inc. 

It s a long hill we re climbing, but efforts like this will ensure that games will one day realize their full potential. 

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