Sample Detail of
Sample: Sample No. 92AD28A-4 -- USGS No. 12461-SD
Locality: Field No. 92AD28A-4
Description: Howard Pass B-5. Lat. 68o 29'43: N., Long. 158o 35'00" W. Skeletal lime grainstone lenses containing crinoid ossicles. Thin section is crinoidal pack/gainstone with brachiopod and coral fragments, ostracodes, and minor carbonate intraclasts; many bioclasts are micritized. Collected from unnamed Devonian limestone, 18 m stratigraphically below 92AD28A-22. (description from Dover et al., 2004, p. 44 (Table 1)); [Howard Pass B-5. 68°29'43", 158°35'00". Skeletal lime grainstone lenses with crinoids. Collected from unnamed Devonian limestone, 18 m stratigraphically below 92AD28A-22.
From same locality as 92 AD28A-22. (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: 11 S. 29 W. Section: 13
Lat.: 68o29'43 " Long.: 158o35'00 "
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: Middle Devonian (middle Middle Devonian)
Formation: Unnamed (Unnamed limestone (Devonian))
CAI:Min: 3
Comment:Age: middle Middle Devonian; Po. ensensis Zone on the basis of conodonts in this and in overlying sample 92AD28A-22; Eifelian-Givetian boundary interval.

Polygnathid biofacies: the taphonomy of the conodonts indicates postmortem transport within this biofacies as most ramiform elements have been winnowed out; the polygnathid species suggest a relatively high-energy, shallow to mid-shelf depositional setting.

Shown as locality 74 on Sheet 2; map unit: Dl

CAI=3

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 8 Belodella sp. elements All conodonts identified by A.G. Harris
2 Conodonts 5 Neopanderodus sp. elements
3 Conodonts 1 Pa element Polygnathus linguiformis linguiformis Hinde epsilon morphotype
4 Conodonts 10 Pa elements Polygnathus parawebbi Chatterton
5 Conodonts Polygnathus spp. indet., 23 Pa and 4 M elements
6 Conodonts Unassigned elements: 8 Pb (3 morphotypes), 1 Sa, 1 Sb and 9 Sc (3 morphotypes)
7 Conodonts 70 indet. bar, blade, and platform fragments
8 Snails 1 phosphatized gastropod steinkern

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: Eifelian-Givetian (Eifelian - Givetian boundary (= middle Middle Devonian))
Formation: Unnamed (Unnamed Devonian limestone)
CAI:Min: 3
Comment:Age: T.k. australis Zone to Lower Po. varcus Subzone; middle Eifelian-middle Givetian (= middle Middle Devonian); the one specimen of Po. li. linguiformis epsilon morphotype could restrict the age to the Po. ensensis Zone or Lower Po. varcus Subzone. But the overlying sample is restricts the age to the Po. ensensis Zone; = Eifelian-Givetian boundary interval; = middle Middle Devonian.
Biofacies: Polygnathid biofacies: the taphonomy of the conodonts indicates postmortem transport within this biofacies as most ramiform elements have winnowed out; the polygnathid species suggest a relatively high-energy shallow- to mid-shelf depositional setting.
CAI 3

Heavy mineral concentrate: chiefly barite, minor iron oxides, dolomite, phosphatized composite grains and bioclasts.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 8 Belodella sp. elements
2 Conodonts 5 Neopanderodus sp. elements
3 Conodonts 1 Pa Polygnathus linguiformis linguiformis Hinde epsilon morphotype
4 Conodonts 10 Pa elements Polygnathus parawebbi Chatterton
5 Conodonts Polygnathus spp. 23 Pa and 4 M elements
6 Conodonts UNASSIGNED ELEMENTS: 8 Pb (3 morphotypes), 1 Sa, 1 Sb and 9 Sc (3 morphotypes)
7 Conodonts 70 indet. bar, blade, and platform fragments
8 Snails 1 phosphatized gastropod steinkern

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: Eifelian-Givetian (Eifelian - Givetian boundary interval (middle Middle Devonian))
Formation: Unnamed (unnamed Devonian limestone)
CAI:Min: 3
Comment:Age: T. k. australis Zone to Lower Po. varcus Subzone; middle Eifelian-middle Givetian (= middle Middle Devonian); the one specimen of Po. li. linguiformis espilon morphotype could restrict the age to the Po. ensensis Zone or Lower Po. varcus Subzone. But the overlying sample restricts the age age to the Po. ensensis Zone; =Eifelian=Givetian boundary interval; =middle Middle Devonian.
Biofacies: Polygnathid biofacies: the taphonomy of the conodonts indicates postmortem transport within this biofacies as most ramiform element have been winnowed out; the polygnathid species suggest a relatively high-energy shallow- to mid-shelf depositional setting.
CAI=3

Heavy mineral concentrate: chiefly barite, minor iron oxides, dolomite, phosphatized composite grains and bioclasts.
Wgt. (kg) 7.1; >20 mesh insol. res., (grams) 120; 20-200 mesh insol. res., (grams) 41

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 8 Belodella sp. elements
2 Conodonts 5 Neopanderodus sp. elements
3 Conodonts 1 Pa element Polygnathus linguiformis linguiformis Hinde epsilon morphotype
4 Conodonts 10 Pa elements Polygnathus parawebbi Chatterton
5 Conodonts Polygnathus spp. indet. 23 Pa & 4 M elements
6 Conodonts 8 Pb (3 morphotypes), 1 Sa, 1 Sb & 9 SC (3 morphotypes)
7 Conodonts 70 indet. bar, blade, and platform fragments
8 Snails 1 phosphatized gastropod steinkern