Biozonation of the furongian (upper Cambrian) alum shale formation at Hunneberg, Sweden
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Biozonation of the furongian (upper Cambrian) alum shale formation at Hunneberg, Sweden. / Rasmussen, Bo Wilhelm; Rasmussen, Jan Audun Liljeroth; Nielsen, Arne Thorshøj.
In: GFF, Vol. 138, No. 4, 2016, p. 467-489.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Biozonation of the furongian (upper Cambrian) alum shale formation at Hunneberg, Sweden
AU - Rasmussen, Bo Wilhelm
AU - Rasmussen, Jan Audun Liljeroth
AU - Nielsen, Arne Thorshøj
PY - 2016
Y1 - 2016
N2 - The Furongian Alum Shale at Nygård, Hunneberg, Sweden, has been sampled for trilobites.The section is ≥12.20 m thick and comprises a relatively thick Olenus superzone, overlain by morecondensed Parabolina, Leptoplastus, Protopeltura and Peltura superzones. The section is truncated lowin the Peltura superzone, presumably due to late Furongian uplift. The internal zonation of the sparselyfossiliferous Olenus superzone is unsettled. Above that level, the Parabolina spinulosa, Leptoplastuscrassicornis–Leptoplastus angustatus, Sphaerophthalmus flagellifer, Ctenopyge similis, Ctenopygespectabilis, Ctenopyge tumida and Ctenopyge bisulcata zones are documented. The C. similis–C. spectabilis zonal interval yielded a lower faunal assemblage with Ctenopyge (Mesoctenopyge) erecta,Sphaeropthalmus modestus and Ctenopyge (M.) spectabilis and an upper assemblage with Ctenopyge(M.) similis, Sphaeropthalmus angustus and Protopeltura planicauda. Hence, the FAD’s of C. (M.) similisand C. (M.) spectabilis are opposite of the previously described pattern. We informally refer to the lowerassemblage as the S. modestus biozone and to the upper assemblage as the S. angustus biozone (believedto be equivalent to the C. similis and C. spectabilis chronozones, respectively). It is possible that the truerange of the rare species C. (M.) similis has to date escaped recognition. Alternatively, if the existingchronozonation is correct, this implies reworking and the discussed interval at Nygård must in that caserepresent the C. spectabilis Zone. Ctenopyge (Ctenopyge) bisulcata, C. (M.) similis, C. (M.) spectabilis,L. angustatus, L. crassicornis, Leptoplastus paucisegmentatus?, Peltura scarabaeoides scarabaeoides,Peltura planicauda, Sphaerophthalmus alatus, Sphaerophthalmus drytonensis, S. modestus, Triangulopygehumilis and Triangulopyge majusculus have not previously been reported from the locality.
AB - The Furongian Alum Shale at Nygård, Hunneberg, Sweden, has been sampled for trilobites.The section is ≥12.20 m thick and comprises a relatively thick Olenus superzone, overlain by morecondensed Parabolina, Leptoplastus, Protopeltura and Peltura superzones. The section is truncated lowin the Peltura superzone, presumably due to late Furongian uplift. The internal zonation of the sparselyfossiliferous Olenus superzone is unsettled. Above that level, the Parabolina spinulosa, Leptoplastuscrassicornis–Leptoplastus angustatus, Sphaerophthalmus flagellifer, Ctenopyge similis, Ctenopygespectabilis, Ctenopyge tumida and Ctenopyge bisulcata zones are documented. The C. similis–C. spectabilis zonal interval yielded a lower faunal assemblage with Ctenopyge (Mesoctenopyge) erecta,Sphaeropthalmus modestus and Ctenopyge (M.) spectabilis and an upper assemblage with Ctenopyge(M.) similis, Sphaeropthalmus angustus and Protopeltura planicauda. Hence, the FAD’s of C. (M.) similisand C. (M.) spectabilis are opposite of the previously described pattern. We informally refer to the lowerassemblage as the S. modestus biozone and to the upper assemblage as the S. angustus biozone (believedto be equivalent to the C. similis and C. spectabilis chronozones, respectively). It is possible that the truerange of the rare species C. (M.) similis has to date escaped recognition. Alternatively, if the existingchronozonation is correct, this implies reworking and the discussed interval at Nygård must in that caserepresent the C. spectabilis Zone. Ctenopyge (Ctenopyge) bisulcata, C. (M.) similis, C. (M.) spectabilis,L. angustatus, L. crassicornis, Leptoplastus paucisegmentatus?, Peltura scarabaeoides scarabaeoides,Peltura planicauda, Sphaerophthalmus alatus, Sphaerophthalmus drytonensis, S. modestus, Triangulopygehumilis and Triangulopyge majusculus have not previously been reported from the locality.
KW - Faculty of Science
KW - Cambrian
KW - Furongian
KW - alum shale
KW - biostratigraphy
KW - trilobites;
KW - Sweden
KW - Scandinavia
U2 - 10.1080/11035897.2016.1168866
DO - 10.1080/11035897.2016.1168866
M3 - Journal article
VL - 138
SP - 467
EP - 489
JO - G F F
JF - G F F
SN - 1103-5897
IS - 4
ER -
ID: 162217197