TY - JOUR
T1 - Middle to Late Ordovician age for the Jindalee Group of the Lachlan Fold Belt, New South Wales
T2 - conodont evidence and some tectonic implications
AU - Lyons, P.
AU - Percival, I. G.
PY - 2002
Y1 - 2002
N2 - The first definitive evidence for a late Middle to early Late Ordovician age for the Jindalee Group comes from identification of conodonts, including Periodon aculeatus, preserved in chert from an exposure northeast of Cootamundra, New South Wales. In the Grenfell area, the Hoskins Chert, a constituent formation of the Jindalee Group, also yields conodonts of the same general age, although no diagnostic species have been recognised. Conodonts found in the Jindalee Group, along with a distinctive fossil flora of probable cyanobacterial filaments, are similar to those of the Mugincoble Chert in the vicinity of Parkes. Age correlation of the Jindalee Group with the Girilambone Group is confirmed by the newly found conodonts, but at a much more precise level than previously inferred. However, the tectonic settings of the Jindalee and Girilambone Groups might have been quite distinct, with the Jindalee Group forming in an intra-arc rift and the Girilambone Group depositing in the backarc Wagga Marginal Basin.
AB - The first definitive evidence for a late Middle to early Late Ordovician age for the Jindalee Group comes from identification of conodonts, including Periodon aculeatus, preserved in chert from an exposure northeast of Cootamundra, New South Wales. In the Grenfell area, the Hoskins Chert, a constituent formation of the Jindalee Group, also yields conodonts of the same general age, although no diagnostic species have been recognised. Conodonts found in the Jindalee Group, along with a distinctive fossil flora of probable cyanobacterial filaments, are similar to those of the Mugincoble Chert in the vicinity of Parkes. Age correlation of the Jindalee Group with the Girilambone Group is confirmed by the newly found conodonts, but at a much more precise level than previously inferred. However, the tectonic settings of the Jindalee and Girilambone Groups might have been quite distinct, with the Jindalee Group forming in an intra-arc rift and the Girilambone Group depositing in the backarc Wagga Marginal Basin.
KW - Conodonts
KW - Girilambone Group
KW - Jindalee Group
KW - Ordovician
UR - http://www.scopus.com/inward/record.url?scp=0036800864&partnerID=8YFLogxK
U2 - 10.1046/j.1440-0952.2002.00951.x
DO - 10.1046/j.1440-0952.2002.00951.x
M3 - Article
VL - 49
SP - 801
EP - 808
JO - Australian Journal of Earth Sciences
JF - Australian Journal of Earth Sciences
SN - 0812-0099
IS - 5
ER -