graptolites are thin, often shiny, markings on rock surfaces that look like Their stipes were few and arranged in various ways: e.g. Callograptus resembles its relative Dictyonema flabelliforme (Community 3) in many details, including the large number of branches; its attached mode of life was similar to that of the earlier Middle Cambrian graptolites from which Dictyonema flabelliforme and the later pelagic graptolites were probably derived. 18 of 18. Field Mus. Some graptolite forms; including those fixed It was relatively large for a graptolite; several kinds of individuals were present in a colony. Ni Yunan & Cooper, R. A., 1994:03:28. scandent). Graptolites: fossil focus. MODE OF LIFE OF GRAPTOLITES 537 ' In colonies living in suspension with the sicular aperture facing upwards, a change in the inclination of the stipes to horizontal and

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