Publication Date:
2012-07-11
Description:
In his work, Butterfield (1) makes several claims about carbonate cements in the Walcott Quarry Member of the Burgess Shale, including the contention that they are not regularly associated with fossil-bearing beds. This claim is inaccurate. Each millimeter- to centimeter-scale bed within the interval is cemented by calcite (figures 2–5 in ref. 2), including the exceptionally fossiliferous Great Marella Layer referred to in the work (1), which contains cements dispersed throughout its thickness and a prominently-cemented top (Fig. 1). The work by Butterfield (1) also suggests that the carbonate cements in the Burgess Shale were derived from recrystallization of coarse-grained...
Keywords:
Letters
Print ISSN:
0027-8424
Electronic ISSN:
1091-6490
Topics:
Biology
,
Medicine
,
Natural Sciences in General
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