FIG. 1.—Generalized location map of Big Cottonwood Canyon, southeast of Salt Lake City. Circled numbers refer to measured sections of: 1, Storm Mountain (Fig. 7); 2, S-curve (Fig. 9B); 3, Moss Ledge (Fig. 9A). ABSTRACT: The Mesoproterozoic to Neoproterozoic Big Cottonwood Formation of north-central Utah contains some of the oldest known (; 900 Ma) examples of cyclic tidal rhythmites. Despite mi...

argillite, interbedded basalt and abundant diabase sills. More specifically, the rhodonite is located above a section of grey, black and pale green chert and argillite at the base of the unit [IIPPvs( I ) on Figure 2-15-21 and about 50 metres below an upper section of brightly coloured, maroon, red, green and grey chert and argillite [Unit IIPPvs(2) on Figure 2-15-21, This stratigraphic positio...

taposed along the north-trending, high-angle Nahlin fault; all three tectonic elements are intruded by the Late Cretaceous Atlin Mountain pluton (Figure 1-19-2). The oldest rocks in the eastern domain are Mississippian to Triassic oceanic; crustal and sedimentary rocks of the Cache Creek Complex. These include ultramafite, basalt, limestone, chert, argillite and wacke, and probably a mixed ultr...

Reusing excavated material in geotechnical engineering reduces the carbon impact of a project. Such materials are usually placed compacted state order to achieve mechanical and hydric characteristics required guarantee safety structures. A good knowledge is therefore necessary as well anticipation their behaviour over time. Indeed, some situations, case waste storage, low hydraulic conductivity...

The Callovo-Oxfordian (COx) argillite is a possible host rock for radioactive waste disposal in which the ANDRA underground laboratory of Bure (East of France) has been excavated. In this paper some aspects of the volume change behaviour of the COx argillite are investigated. To do so, high pressure oedometers with a maximum capacity of 113 MPa have been used. In a first stage, swelling tests w...

pillow lavas are locally conspicuous. A unit consisting of dark, thinly bedded sandstone and siltstone, lccally ranging to several hundred feet thick, is lowermost in the exposed section. The middle division consists of about 3,500 feet of mixed andesi.:e and basalt volcaniclastic rocks ~ lahar, tuff breccia, volcanic sandstone, and conglomeratic beds which rest on relatively thin, fossiliferou...