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Supporting Information Notes S1, Tables S2-S4, Fig. S1 Notes S1: Fossil Calibrations (see text for references).
 

Summary: Supporting Information Notes S1, Tables S2-S4, Fig. S1
Notes S1: Fossil Calibrations (see text for references).
We used a total of eight fossil calibration points, of which three were within Juniperus
and five outside it. For each fossil, the conversion of stratigraphical divisions into age
ranges followed Grandstein et al. (2004) and ICS 2007 (International Stratigraphic
Chart by International Commission on Stratigraphy, available at
http://www.geobiodiversity .com/Download/ISC.pdf). Molecular dating analyses
generally require one fixed age calibration point in addition to any minimum age
calibration points, however in preliminary analyses using BEAST, meaningful results
could not be obtained unless two fixed age calibration points were included. Therefore
we fixed the age of the two oldest calibration points within the phylogeny, and used the
six younger fossils as minimum age calibration points.
The oldest fixed age calibration point used was the stem lineage of Chamaecyparis,
which was set to be 99.6 MYA (lower bound of Late Cretaceous, calibration point H,
Fig. 3), given that seed cone or foliage remnants comparable to Chamaecyparis occur
frequently from this point onwards (Farjon, 2005; Stockey et al., 2005 and references
therein). The second fixed age calibration point used was the crown lineage of
Chamaecyparis, which was set to be 83.5 MYA (upper boundary of Santonian,
calibration point G, Fig. 4). This is based on the fossil record of Chamaecyparis
corpulenta (McIver, 1994) which indicate diversification within Chamaecyparis from

  

Source: Adams, Robert P. - Department of Biology, Baylor University

 

Collections: Biology and Medicine