caa a22 4500 386402272 CHVBK 20180307112204.0 cr unu---uuuuu 161130e198903 xx s 000 0 eng 10.1017/S0016756800006294 doi S0016756800006294 pii (NATIONALLICENCE)cambridge-10.1017/S0016756800006294 Trace fossils from the type ‘Etcheminian Series' (Lower Cambrian Ratcliffe Brook Formation), Saint John area, New Brunswick, Canada [Elektronische Daten] Selected trace fossils from the type section of the ‘Etcheminian Series' at Hanford Brook are described and illustrated: Helmithoidichnites tenuis Fitch, Monocraterion sp., Palaeophycus tubularis Hall, Planolites sp., Psammichnites gigas Matthew, Subphyllochordra? sp., Taphrhelminthoida dailyi n. sp., and Taphrhelminthopsis cf. T. circularis Crimes et al. The assemblage has elements comparable to those in other Lower Cambrian sequences. It formed in shallow water settings, is mainly endichnial, and contains systematic, guided meander traces that are generally characteristic of deep-water environments in younger sequences; this may be related to global environmental changes early in the Palaeozoic. The guided meander traces are characterized morphometrically, using an image analyser: the meander systems exhibit a strongly bimodal distribution of morphologic elements, reflecting a well developed taxis (sense for position, direction, and distance) during trace production. The method of morphometric analysis has potential for characterizing trace fossils generally, somewhat like X-ray diffractograms characterize minerals. Copyright © Cambridge University Press 1989 Hofmann H. J. Department of Geology, University of Montreal, Montreal, Quebec, Canada H3C 3J7 Patel I. M. Department of Geology, University of New Brunswick, Saint John, New Brunswick, Canada E2L 4L5 Geological Magazine Cambridge University Press 126/2(1989-03), 139-157 0016-7568 126:2<139 1989 126 GEO https://doi.org/10.1017/S0016756800006294 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0016756800006294 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hofmann H. J. Department of Geology, University of Montreal, Montreal, Quebec, Canada H3C 3J7 NATIONALLICENCE 700 1- Patel I. M. Department of Geology, University of New Brunswick, Saint John, New Brunswick, Canada E2L 4L5 NATIONALLICENCE 773 0- Geological Magazine Cambridge University Press 126/2(1989-03), 139-157 0016-7568 126:2<139 1989 126 GEO CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge