Ichnofossils

Phycodes palmatus Hall, 1852

Taxon description

Knaust, 2004

Horizontal hypichnial burrow system at the interface of a fine-grained sandstone and claystone with a slightly curved stem, 12mm in diameter, from which four gently curved and closely spaced burrows branch out.The distal parts of the branches are not preserved. Their oval cross-sections probably result from compaction. Burrow diameter is 8–10mm in the horizontal and 3–5mm in the vertical axis.

Mángano et al., 2002a

Horizontal branching system, consisting of a few branches developed from a single proximal tunnel and arranged in a digitate pattern. Branches taper laterally. Diameter of individual branches is highly variable. Tunnel fill similar to host rock. Trace diameter 5.3-8.1 mm. Lenght of structure 66.4mm. Preserved as positive hyporelief.

Synonymy list
1985     Phycodes (Buthrolepis) palmatum Hall, 1852 — Crimes & Anderson, pp. 330, fig. 6.15-6.17
1986     Buthotrephis palmata Hall, 1852 — Clausen & Vilhjalmsson, pp. 53, fig. Fig. 3 Pl. 7:1a,b
1989     Phycodes palmatum (Hall, 1852) — Orłowski, pp. 220, fig. 16:2
1994     Phycodes palmatus Hall, 1852 — Han & Pickerill, fig. 5:12
1997     Phycodes palmatus (Hall, 1852) — Jensen, pp. 78, fig. 40B?, 50, 5 l B
1998     Phycodes palmatus (Hall, 1852) — Stanley & Pickerill, pp. 23, fig. 10:3
2002     Phycodes palmatus Hall, 1852 — Mangano et al., pp. 54, fig. 45A
2004     Phycodes palmatus Hall, 1852 — Knaust, pp. 16-17, fig. 7.3
Selection of related publications
Knaust, D. 2004. Cambro-Ordovician trace fossils from the SW-Norwegian Caledonides. Geological Journal 39, 1, 1-24. DOI:10.1002/gj.941
Jensen, S., Grant, S. W. F. 1998. Trace fossils from the Dividalen Group, northern Sweden: implications for Early Cambrian biostratigraphy of Baltica. Norsk Geologisk Tidsskrift 78, 4, 305-317.
Jensen, S. 1997. Trace fossils from the Lower Cambrian Mickwitzia sandstone, south-central Sweden. Fossils and Strata 42, 1-110.
Clausen, C. K., Vilhjálmsson, M. 1986. Substrate control of lower Cambrian trace fossils from Bornholm, Denmark. Palaeogeography, Palaeoclimatology, Palaeoecology 56, 1-2, 51-68. DOI:10.1016/0031-0182(86)90107-0