Gordia marina Emmons, 1844

Taxon description

Hammersburg et al., 2018

Diagnosis.—Thin, arcuate to winding burrows or trails with self-overcrossing patterns (De Gibert & others, 2000).

Gaillard & Racheboeuf, 2006

Discussion.-Tunnels, which are systematically observed at the top of rippled beds, are clearly dug very superficially. Locally, their upper wall may collapse. Some areas show simple gently sinuous forms, probably illustrating locomotion. Other areas show dense looped forms, probably indicating grazing. These traces are clearly more abundant and more complex along the crests of ripplemarks (Fig.5.6). On these crests, the sediment is thinner and more oxygenated. This last point is attested to by a concentration of probable air bubbles along the ripple crests (Fig. 8.8), possibly because of the presence of a thin microbial film. Gordia probably corresponds to a surficial burrow made soon after the deposit that shows an active search for food by a shallow infaunal animal. These traces generally are interpretated as grazing traces (Buatois et al.,1997).

Knaust, 2004

The smooth, unbranched shallow horizontal burrows have a constant diameter of 1mm and wind irregularly over a length of several centimetres, where they cross themselves and other burrows. Some examples exhibit a distinct median groove that is persistent over a distance of a few millimetres. Burrow fill is similar to the host rock and may exhibit delicate transverse striae.

Synonymy list
1844     Gordia marina — Emmons, pp. 24, fig. 2
1982     Gordia marina Emmons, 1844 — Benton, fig. 8a,b
1985     Gordia marina Emmons, 1844 — Crimes & Anderson, pp. 320, fig. Fig. 6.5, 6.6
1992     Gordia marina Emmons, 1844 — Pickerill, pp. 23, fig. 4D
1996     Gordia marina Emmons, 1844 — Orr, pp. 201, fig. 6a
1998     Gordia marina Emmons, 1844 — Stanley & Pickerill, pp. 14, fig. 5:4
2004     Gordia marina Emmons, 1844 — Knaust, pp. 13, fig. 6.1
2006     Gordia marina Emmons, 1844 — Gaillard & Racheboeuf, pp. 1209, fig. 5.3; 5.5; 5.6
2007     Gordia marina — Landing et al., pp. 288, fig. 1
2009     Gordia marina Emmons, 1844 — Wang et al., pp. 142, fig. Fig. 2, 3, 4
2012     Gordia marina Emmons, 1844 — Hofmann et al., pp. 937, fig. 7.2, 7.3
2018     Gordia marina Emmons, 1844 — Hammersburg et al., pp. 20, fig. Figure 12.1–12.4
2019     Gordia marina Emmons, 1844 — Gougeon et al., pp. 18, fig. Fig. 6.1
Selection of related publications
Landing, E., Peng, S., Babcock, L. E., Geyer, G., Moczydlowska-Vidal, M. 2007. Global standard names for the Lowermost Cambrian Series and Stage. Episodes 30, 4, 287-289. DOI:10.18814/epiiugs/2007/v30i4/004
Davies, N. S., Sansom, I. J., Turner, P. 2006. Trace fossils and paleoenvironments of a Late Silurian marginal-marine/alluvial system: the Ringerike Group (Lower Old Red Sandstone), Oslo Region, Norway. Palaios 21, 1, 46-62. DOI:10.2110/palo.2003.p03-08
Knaust, D. 2004. Cambro-Ordovician trace fossils from the SW-Norwegian Caledonides. Geological Journal 39, 1, 1-24. DOI:10.1002/gj.941
References based on distribution