S2/f528 - Anthill Black Shale, Anthill Creek (Ordovician of New Zealand)

Also known as GS 7487

Where: New Zealand (40.7° S, 172.7° E: paleocoordinates 13.2° N, 166.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Anthill Black Shale Member (Aorangi Mine Formation), Castlemainian (470.0 - 470.3 Ma)

• STRATIGRAPHIC RELATIONS: Derived from Anthill Black Shale Member of Aorangi Mine Fm, which overlies the Malone Mbr (lower and middle Lancefieldian) and is overlain by the Battery Mb (upper Castlemainian and lower Yapeenian). THICKNESS: 150 m in type section. AGE: Zone of I. v. lunatus (upper part), corresponding to the upper part of the member and is hence upper early Castlemannian. STRATIGRAPHIC POSITION: Presumably upper part of Anthill Black Shale Mbr.

• bed-level stratigraphic resolution

Environment/lithology: basinal (); lithified, pyritic, black, cherty/siliceous shale

• ENVIRONMENT: Quiet bottom water, lack of circulation, plankton-rich, extreme paucity of incoming clastic detritus, slow persistent supply of biogenic silica. Environment of deposition presumed to be that of a starved offshore basin within or adjacent to a region of normal clastic deposition. Water depth likely to have been with the range of the bathyal depth zone.
• SPECIFIC LITHOLOGY: Extremely hard, siliceous, pyritic black shale and chert. LITHIFICATION: Lithified, as text states lithology to be "extremely hard".

Size class: macrofossils

Preservation: original carbon

Reposited in the IGNS

Collection methods: bulk,

• COLLECTOR: S.K. Swarko (1959). REPOSITORY: New Zealand Geological Survey (now GNS Science), Lower Hutt, New Zealand

Primary reference: R. A. Cooper. 1979. Ordovician Geology and Graptolite faunas of the Aorangi Mine area, North-west Nelson, New Zealand. New Zealand Geological Survey Paleontological Bulletin 47 [A. Miller/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 63196: authorized by Austin Hendy, entered by Austin Hendy on 09.08.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• COMPLETENESS: Only graptolite taxa listed, however no other faunas mentioned in text, except rare phyllocarid crustaceans. IDENTIFICATIONS: Older collections re-examined by R.A. Cooper, otherwise lists collected and identified by R.A. Cooper.
Show authors, comments, and common names
Pterobranchia
 Graptoloidea - Sigmagraptidae
Goniograptus sp.
Goniograptus sp. McCoy 1876 graptolite
 Graptoloidea - Phyllograptidae
Tetragraptus sp., Tetragraptus whitelawi
Tetragraptus sp. Salter 1863 graptolite
 Graptoloidea - Dichograptidae
Dichograptus octonarius, Didymograptus sp., Didymograptus cf. extensus
Didymograptus sp. McCoy 1851 graptolite
Didymograptus cf. extensus Hall 1858 graptolite
 Graptoloidea - Isograptidae
Isograptus victoriae
Isograptus victoriae Harris 1933 graptolite
 Graptoloidea - Glossograptidae
Pseudisograptus hastatus
Pseudisograptus hastatus Harris 1933 graptolite
form A
Algae
  -
"Tetragraptus serra" = Fucoides serra
"Tetragraptus serra" = Fucoides serra Brongniart 1828