Sample Detail of
Sample: Sample No. 92AD25H -- USGS No. 12459-SD
Locality: Field No. 92AD25H
Description: Howard Pass B-4. Lat. 68o 20'56" N., Long. 158o 16'00" W. Massive, stromatoporoid-crinoidal lime packstone. Thin section is skeletal packstone containing <1 percent angular quartz silt; diverse bioclasts include crinoid ossicles, stromatoporoid fragments and algae(?). Collected from a discrete approx. 10 x 20 m block of unnamed Devonian limestone within Copter Peak basal unit of Siniktanneyak mafic complex. Conodonts of Late Devonian age previously reported from this locality (table 4; fossil locality 7 of Nelson and Nelson, 1982). (description from Dover et al., 2004, p. 49 (Table 1)); [Howard Pass B-4. 68°20'58", 158°16'00". Massive, stromatoporoid-crinoidal lime packstone.
Collected from a discrete ~ 10 m x 20 m block of unnamed Devonian rocks depositionally(?) associated with Siniktanneak mafic complex.
From same locality as above ("referring to 92AD25E"). [description from Harris E&R reports dated Jan. 25, 1995 (Shipment no. A-95-3a) and March 17, 1995 (Shipment no. A-95-30)]
Location: Alaska Quadrangle: Howard Pass B-4
Township&Range: 34 N. 3 E. Section: 19
Lat.: 68o20'56 " Long.: 158o16'00 "
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 (Frasnian))
Formation: Unnamed (Basalt (Jurassic? to Devonian?))
CAI:Min: 3
Comment:Age: early Late Devonian (Frasnian)

Biofacies: Indeterminate (too few conodonts). Conodonts suggest normal-marine, shelfal environment.

Shown as locality 112 on Sheet 2; map unit: JDbc

CAI=3

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 posterior Pa element fragment Ancyrodella sp.indet. All conodonts identified by A.G. Harris
2 Conodonts 1 Pa element fragment Polygnathus sp. indet.
3 Conodonts 6 indet. bar, blade, and platform 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
Formation: Unnamed (unnamed Devonian limestone)
CAI:Min: 3
Comment:Age: Frasnian
Biofacies: Indeterminate (too few conodonts). Conodonts suggest normal-marine shelfal environment.
CAI 3

Heavy-mineral concentrate: chiefly chloritic(?) composite grains.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 posterior Pa element fragment Ancyrodella sp. indet.
2 Conodonts 1 Pa element fragment Polygnathus sp. indet.
3 Conodonts 6 indet. bar, blade, and platform fragments

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
Formation: Unnamed (unnamed Devonian limestone)
CAI:Min: 3
Comment:Age: Frasnian
Biofacies: Indeterminate (too few conodonts). Conodonts suggest normal-marine, shelf environment.
CAI=3

Heavy-mineral concentrate: chiefly chloritic(?) composite grains.
Wgt. (kg) 7.4; >20 mesh insol. res., (grams) 280; 20-200 mesh insol. res., (grams) 43

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 posterior Pa element fragment Ancyrodella sp. indet.
2 Conodonts 1 Pa element fragment Polygnathus sp. indet.
3 Conodonts 6 indet. bar, blade, and platform fragments