Species

Chondrites targionii (Brongniart, 1828)

Taxon description

Fan, R. et al., 2021

Dendritic burrow system with slightly curved branches and wellexpressed primary successive branching. Three to four orders of branching are observed and the branching angle is 25◦ − 46◦. The tunnels are about 3 mm wide.

Baucon et al., 2020c

Chondrites targionii (Brongniart, 1828) is characterized by well-expressed primary successive branching and few secondary branches. Branching angle acute. Curved branches are common (Uchman, 1998, 1999; Rodríguez-Tovar and Uchman, 2004; Fan and Gong, 2016).

Razzolini et al., 2016

Description. Slightly winding or arcuate, branched flattened tunnels. Second-order branches are dominant. Third-order branches are very rare. Most of the tunnels are 3-5mm wide. They are filled with dark argillaceous background sediments. Branches are very long, some attaining at least 17 cm, and the whole burrow system may be up to 30 cm across. Weathered cross-sections of the upper part of the burrow system show clusters of small knobs or holes on horizontal bedding or parting surfaces.

Synonymy list

1828 Fucoides targionii — Brongniart , pp. 56, fig. 4:2, 6

1833 Sphaerococcites affinis — Sternberg , pp. 28, fig. 7:1

1833 Caulerpites pyramidalis — Sternberg , pp. 21, fig. 8:2

1851 Chondrites furcatus — Schafhäutl , fig. 5:6; 6:7; 7:7a, 8

1893 Chondrites affinis Heer — Fuchs , pp. 1

1896 Phycopsis affinis Sternb. — Rothplets , pp. 885, fig. 22:1-2

1897 Fucoiden large form — Suess , pp. 4, fig. 2

1978 Chondrites furcatus — Kern , fig. 5

1991 Chondrites targionii (Brongniart) — Fu , pp. 23, fig. 3a-b

1998 Chondrites targionii Brongniart, 1828) — Uchman , pp. 123, fig. 21

Classification

Organism group	Biota
Ichnofossil group	Ichnofossils
	Soft-sediment trace fossils
Genus	Chondrites
Species	affinis
	bollensis
	caespitosus
	intricatus
	patulus
	recurvus
	stellaris
	targionii