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The BSU lab uses the highest precision dating methods available, with U/Pb analyses of zircons yielding dates with an error around 0.1%.Over the last 20 years, knowledge of the stratigraphy and ages of rock units in the John Day Basin has improved dramatically.Multiple researchers have worked in all three units of the monument and surrounding areas to produce a detailed stratigraphic framework for this region. (2008) refined the stratigraphy of the Mascall Formation, while work continues on revision of the stratigraphy of the Rattlesnake Formation begun by Martin and Fremd (2001).Contract work done by Greg Retallack and Eric Bestland provided a stratigraphic framework for the Clarno and Painted Hills units of the monument, primarily rocks from the Clarno and John Day Formations (Bestland and Retallack 1994a, b, Bestland et al. Hunt and Stepleton (2004) completely redefined the upper part of the John Day Formation, splitting the "Haystack Valley Member" into a series of four distinct members. (2008) expanded on these studies to produce a revised composite stratigraphy of the entire complex sequence of beds from the John Day Formation, including 7 members and more than 20 lithostratigraphic units (Fremd et al. Radiometric dates from a number of sources have been combined with lithostratigraphic and magnetostratigraphic data to produce a highly refined chronostratigraphy of rock layers exposed throughout the region.Many dates were part of the doctoral dissertation of Carl C.

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