Sample Detail of
Sample: Sample No. 92AD21B -- USGS No. DR 1516
Locality: Field No. 92AD21B
Description: Howard Pass C-3. Lat. 68o 38'2.4" N., Long. 157o 32'45" W. Sample from 2 m below top of approx. 5-m-thick chert interval; green and white banded chert in 5-cm-thick beds. In thin section, chert is fine-grained, greenish-brown, clay-rich(?) and contains minor spicules and radiolarians. (description from Dover et al., 2004, p. 55 (Table 2)); [Formation: Unnamed chert unit - Ipnavik unit of Lisburne Gp. -- or (possibly) facies equivalent of upper Ipnavik unit. USGS Howard Pass 1:250,000 C3 quadrangle, T. 9 S., R. 24 W., SW1/4, SW 1/4, sec. 28; near small knob (elev. approx. 640 m) west of unnamed tributary of Cutaway Creek; approx. 4.5 mi west of Pimple Creek and 3.5 mi south of Monument Ridge; same locality as 92AD21A. Lat 68°38'01", long 157°32'42". (description from Blome and Reed E&R report dated June 23, 1993; Shipment no. A-92-9D)]
Location: Alaska Quadrangle: Howard Pass C-3
Township&Range: 9 S. 24 W. Section: 28
Lat.: 68o38'02.4 " Long.: 157o32'45 "
Reference
Title: Geologic and fossil locality maps of the west-central part of the Howard Pass Quadangle and part of the adjacent Misheguk Mountains Quadrangle, western Brooks Range, Alaska ,  2004
Report by: Jim Dover , Irv L. Tailleur , Julie A. Dumoulin
Age: Norian (Late Triassic (early to middle Norian))
Formation: Imnaitchiak Chert
Comment:Age: Late Triassic (early to middle Norian; probably Xipha striata Subzone of the Capnodoce Zone of Blome, 1984).

Shown as locality 26 on Sheet 2; map unit JlPip

REFERENCE
Blome, C.D., 1984, Upper Triassic radiolarians and radiolarian zonation for western North America: Bulletins of American Paleontology, v. 85, no. 318, 88 p.

Occurrence(s)
No. Group Name Qty Notes
1 Radiolarian Poorly preserved forms including Capnuchosphaera sp. (broken tumidaspines only) radiolarians identified by C.D. Blome and K.M. Reed
2 Radiolarian Latium sp. (casts)
3 Radiolarian ?Xenorum sp. (broken spines and partial cortical shells)
4 Radiolarian Xipha striata Blome

Title: Report on Referred Fossils ,  1993 (06/23)
Report by: Charles D. Blome , Katherine M. Reed
Referred by: J. H. Dover
Age: Norian (Late Triassic (early to middle Norian; probably Xipha striata Subzone of the Capnodoce Zone Blome, 1984))
Formation: Lisburne Group (Unnamed chert - above Ipnavik unit of Lisburne Gp. -- or (possibly) facies equivalent of upper Ipanvik unit)
Comment:Age: Late Triassic (early to middle Norian; probably Xipha striata Subzone of the Capnodoce Zone Blome, 1984).

REFERENCES
Blome, C.D., 1984, Upper Triassic Radiolaria and radiolarian zonation from western North America: Bulletins of American Paleontology, v. 85, no. 318, 88 p.

Occurrence(s)
No. Group Name Qty Notes
1 Radiolarian Poorly preserved forms including:
2 Radiolarian Capnuchosphaera sp. (broken tumidaspines only)
3 Radiolarian Latium sp. (casts)
4 Radiolarian ?Xenorum sp. (broken spines and partial cortical shells)
5 Radiolarian Xipha striata Blome