Sample Detail of
Sample: Sample No. 92AD69B -- USGS No. 12468-SD
Locality: Field No. 92AD69B
Description: Howard Pass B-5. Lat. 68o 24'40" N., 158o 54'00" W. Massive, unbedded, crinoidal lime wacke/packstone with stromatoporoids. Thin section is partly dolomitized stromatoporoid wackestone; subordinate bioclasts include crinoid ossicles and brachiopod fragments. Collected from isolated outcrop (fault block?) topographically (and stratigraphically?) below 92AD68C. Table 3 contains megafossil data from this locality. (description from Dover et al., 2004, p. 45 (Table 1)); [Howard Pass B-5. 68°24'40", 158°54". Massive, unbedded, crinoidal lime wacke-packstone with stromatoporoids. Collected from isolated outcrop (fault block?) topographically (and stratigraphically?) below 92AD68C.
From same locality as above ("referring to 92AD68C") except collected ~ 1/10 mile east of 82AD68C. (description from Harris E&R reports dated Jan. 25, 1995 (Shipment no. A-95-3a) and March 17, 1995 (Shipment no. A-95-3)]
Location: Alaska Quadrangle: Howard Pass B-5
Township&Range: 12 S. 30 W, Section: 10
Lat.: 68o24'40 " Long.: 158o54'00 "
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: Frasnian (early Late Devonian (early Frasnian))
Formation: Unnamed (Unnamed limestone (Devonian))
CAI:Min: 3
Comment:Age: early Late Devonian; Pa. transitans Zone through Lower Pa. hassi Zone (early, but not very earliest, Frasnian).

Biofacies: Polygnathid; most conodonts are incomplete, suggesting moderate- to high-energy, middle- to shallow-shelf, normal-marine depositional environment.

Shown as locality 87 on Sheet 2; map unit: Dl

CAI=3

Processed 11.1 kg of rock. All conodonts have a substantial amount of adhering organic matter so that CAI is difficult to determine.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 2 P elements Icriodus symmetricus Branson and Mehl All conodonts identified by A.G. Harris
2 Conodonts 8 Pa elements (incomplete) Polygnathus dubius Hinde
3 Conodonts 10 Pa element fragments Polygnathus sp. indet.
4 Conodonts Unassigned elements: 4 Pb (2 morphotypes), 3 M, 1 Sb, and 3 Sc (2 morphotypes)
5 Conodonts 56 indet. bar, blade, platform, and coniform fragments

Title: Report on Referred Fossils ,  1995 (03/17)
Analysis of all samples is given in the accompanying 16-page table. The range of biostratigraphically important samples is shown on the accompanying diagram. The heavy-mineral concentrates were analyzed by Nancy Stamm; the residues have been returned to Julie Dumoulin. Please note a few (~4 samples have heavy-mineral concentrates that include chalcopyrite and bornite).
Report by: Anita G. Harris
Referred by: Julie A. Dumoulin , J. H. Dover
Age: Frasnian (early, but not very earliest Frasnian)
Formation: Unnamed (unnamed Devonian limestone unit)
CAI:Min: 3
Comment:Age: Pa transitans Zone through Lower Pa. hassi Zone (early, but not very earliest Frasnian) Biofacies: Polygnathid; most conodonts are incomplete suggesting moderate to high energy middle to shallow-shelf, normal-marine depositional environment. This rock must contain some significant amount of organic matter as the conodonts are coated with organic grunge.
CAI = 3

11.1 kg of rock processed (540 g of +20 mesh and 316 g 20-140 mesh insoluble residue).
Heavy-mineral concentrate: chiefly iron oxides and minor dolomite.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts All conodonts have a substantial amount of adhering organic grunge so that CAI is difficult to determine.
2 Conodonts 2 P elements Icriodus symmetricus Branson and Mehl
3 Conodonts 8 Pa elements (incomplete) Polygnathus dubius Hinde
4 Conodonts 10 Pa element fragments Polygnathus sp. indet.
5 Conodonts UNASSIGNED ELEMENTS 4 Pb (2 morphotypes), 3 M, 1 Sb, and 3 Sc (2 morphotypes)
6 Conodonts 56 indet. bar, blade, platform and coniform elements

Title: Report on Referred Fossils ,  1995 (01/25)
All conodont analyses and samples and residue weights are given in the attached tables. The age range of all samples is graphically shown on the accompanying diagram.

Please give a copy of this report to Jim Dover and anyone else on the Howard Pass project that needs these data. I will do all the Carboniferous samples while in Florida.
Report by: Anita G. Harris
Referred by: Julie A. Dumoulin
Age: Frasnian (early, but not very earliest, Frasnian)
Formation: Unnamed (unnamed Devonian limestone unit)
CAI:Min: 3
Comment:Age: Po. transitans Zone through Lower Pa. hassi Zone; (=early, but not very earliest, Frasnian; = early early Late Devonian)
Biofacies: Polygnathid biofacies; most conodonts are incomplete suggesting moderate to high-energy middle to shallow shelf, normal-marine depositional environment. This rock, however, must contain some significant amount of organic matter as the conodonts are coated by it.
CAI=3

Heavy-mineral concentrate: chiefly iron oxides and minor dolomite.
Wgt. (kg) 11.1; >20 mesh insol. res., (grams) 540; 20-200 mesh insol. res., (grams)316

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 2 P elements Icriodus symmetricus Branson and Mehl
2 Conodonts 8 Pa elements (incomplete) Polygnathus dubius Hinde
3 Conodonts 10 Pa element fragments Polygnathus sp. indet.
4 Conodonts UNASSIGNED ELEMENTS:
5 Conodonts 4 Pb (2 morphotypes), 3 M, 1 Sb and 3 Sc (2 morphotypes)
6 Conodonts 56 indet. bar, blade, and platform fragments