Abstract

On the basis of four associated sedimentary features claimed to be indicative of transportation, Rupke (1969) suggested that Stigmaria lying parallel or sub-parallel to the bedding and with appendices or rootlets still radiating from the main root are allochthonous, and not in situ as generally accepted. This opinion is here challenged. The fact that Stigmaria are often filled with sediment different from that enveloping them is not indicative of transport, as this state of preservation often occurs in definitely autochthonous forms (such as in those still attached to erect fossil trees). Evidence of present “fragmentation” is not indicative of breakage prior to deposition and cannot be used as evidence of transport. The data offered to show a “preferred orientation” are inadequate, and transportation as suggested would actually result in a different orientation from that found. Arguments attributing allochthony to Stigmaria occurring in relatively rapidly deposited beds traversed by erect trees are also unconvincing. It is concluded that Stigmaria found in the state described are autochthonous.

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