Ion microprobe UPb zircon age results for the Bishop Tuff (Long Valley; Reid and Coath, 2000) and La Pacana (Schmitt et al., 2002) argue strongly against protracted preeruptive magma contrast, Long Valley postcaldera lavas show evidence for >100 ka crystal residence (Reid et al., 1997) and remelting of solidified and hydrothermally altered precursor intrusions (Schmitt and Simon ...
Various Codes to evaluate sources for use in hydraulic structures such as Rip rap dams, offshore structures such as breakwaters and coastal protection is provided. Although there are differences between the codes, but to an assessment of the aggregate According to the codes, various tests required is often timeconsuming, costly and administratively would be difficult sometimes.
