Detrital Zircon Ages from Early Proterozoic Quartzites,Wisconsin, Support Rapid Weathering and Deposition of Mature Quartz Arenites:A Reply

摘要

Medaris et al.(2005) suggest that the Hamilton Mounds and Baraboo Quartzites are miscorrelated and should not be included together in the Baraboo interval.We fully recognize and stated in Van Wyck and Norman (2004) that the Hamilton Mounds are truncated by a 1763-Ma intrusive rock,and the Baraboo Quartzite contains detrital zircons with an age of 1754 Ma;consequently,the Baraboo is younger than the quartzite at Hamilton Mounds.We have never disputed this observation and in fact use this in our model of post-Penokean sedimentation.