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SOQ-00121 FINAL REPORT: BIOSTRATIGRAPHY OF THE SOQUIP-SCURRY RAINBOW SANDTOP NO 1 WELL, ANTICOSTI ISLAND, QUEBEC FINAL REPORT

CONODONT BIOSTRATIGRAPHY OF THE SOQUIP-SCURRY RAINBOW SANDTOP NO. 1 WELL,

ANTICOSTI ISLAND, QUEBEC

An interim report on this project was submitted on November 16, 1982. The study has now been completed and the results documented in this final report.

On September 27, 1982, I received 65 samples from the SOQUIP-Scurry Rainbow Sandtop No. 1 well, Anticosti Island, Quebec. The object was to try and recover from the samples and provide some biostratigraphic control for the subsurface stratigraphy.

The samples were processed in acetic acid, sieved, separated by heavy liquids, some further separated by magnetic separator, and finally hand picked using a binocular microscope. Many of the samples contained considerable residue and took much longer than usual to fully process. Only 8 were barren, 15 contained indeter- minate conodont fragments, and of the 65 samples received, 42 contained identifiable taxa.

The taxa identified in the samples are reported below, followed by a summary of the stratigraphic conclusions that can be drawn from these data.

SAMPLE Conodont taxa present

SR1 Ozarkodina ap. Panderodus gracilis (Branson and Mehl) P. sp. SR2 Panderodus sp. SR3 Panderodus gracilis (Brandon and Mehl) SR4 kentuckyensis Branson and Branson Icriodella discreta Pollock, Rexroad and Nicoll sp. Ozarkodina sp. Panderodus gracilis (Branson and Mehl) SR5 Icriodella discreta Pollock, Rexroad and Nicoll Ozarkodina sp. Panderodus gracilis (Branson and Mehl) SR6 Icriodella discreta Pollock, Rexroad and Nicoll Ozarkodina sp. Panderodus gracilis (Branson and Mehl) SR7 Panderodus sp. SR8 Icriodella discreta Pollock, Rexroad and Nicoll Panderodus gracilis (Branson and Mehl) SR9 Panderodus gracilis (Branson and Mehl) SR10 Barren SR11 Ozarkodina sp. SR12 Panderodus gracilis (Branson and Mehl) SR13 Distomodus cf. D. kentuckyensis Branson and Branson Ozarkodina cf. O.hassi (Pollock, Rexroad and Nicoll) SR14 Ozarkodina sp. Panderodus sp. - z -

SAMPLE • Conodont taxa present

SR15 Icriodella discreta Pollock, Rexroad and Nicoll SR16 Indeterminate fragments SR17 Panderodus gracilis (Branson and Mehl) SR18 Drepanoistodus suberectus (Branson and Mehl) Aphelognathus cf. A.pyramidalis Branson, Mehl and Branson SR19 Belodina compressa (Branson and Mehl) Drepanoistodus suberectus (Branson and Mehl) Panderodus gracilis (Branson and Mehl) SR20 Barren SR21 ordovicicus Branson and Mehl Panderodus gracilis (Branson and Mehl) SR22 Amorphognathus sp. Panderodus sp. SR23 Panderodus gracilis (Branson and Mehl) SR24 Barren SR25 Barren 5R26 Paroistodus mutatus (Branson and Mehl) SR27 Drepanoistodus suberectus (Branson and Mehl) SR28 Indeterminate fragments SR29 Indeterminate fragments SR30 Amorphognathus.sp. Drepanoistodus suberectus (Branson and Mehl) Panderodus gracilis (Branson and Mehl) Phragmodus undatus Branson and Mehl SR31 Amorphognathus sp. Phragmodus undatus Branson and Mehl SR32 Amorphognathus sp. Panderodus gracilis (Branson and Mehl) SR33 Panderodus gracilis (Branson and Mehl) SR34 Amorphognathus sp. SR35 Indeterminate fragments SR36 Indeterminate fragments SR37 Amorphognathus sp. SR38 Barren SR39 Drepanoistodus suberectus (Branson and Mehl) SR40 Indeterminate fragments SR41 ef. P. grandis Ethington SR42 Indeterminate fragments SR43 Drepanoistodus suberectus (Branson and Mehl) Panderodus sp. SR44 Amorphognathus? sp. SR45 Cardiodella sp. Drepanoistodus cf. D. suberectus (Branson and Mehl) Microcoelodus sp. Panderodus cf. P. gracilis (Branson and Mehl) Polycaulodus cf. P. normalis Branson and Mehl - 3 -

SAMPLE Conodont taxa present

SR46 Indeterminate fragments SR47 Erismodus sp. Polycaulodus tridentatus Branson and Mehl SR48 Coleodus sp. SR49 Indeterminate fragment (hyaline) SR50 Indeterminate fragment SR51 Indeterminate fragment (hyaline) SR52 Indeterminate fragment (hyaline) SR53 Panderodus? sp. SR54 Panderodus sp. Juanognathus? sp. SR55 Indeterminate fragments SR56 Barren SR57 Barren SR58 Drepanodus concavus (Branson and Mehl) Eucharodus cf. E. parallelus (Branson and Mehl) SR59 Drepanoistodus basiovalis (Sergeeva) Glyptoconus.auadraplicatus (Branson and Mehl) SR60 Eucharodus aff. E. quadraplicatus (Branson and Mehl) SR1 Diaphorodus delicatus (Branson and Mehl) Drepanodus concavus (Branson and Mehl) Scolopodus cornutiformis (Branson and Mehl) SR62 Diaphorodus delicatus (Branson and Mehl) Drepanodus concavus (Branson and Mehl) Eucharodus parallelus (Branson and Mehl) Scolopodus cornutiformis Branson and Mehl S. inconstans Branson and Mehl Tropodus comptus Branson and Mehl SR63 Indeterminate fragments SR64 Indeterminate fragments (hyaline) SR65 Barren

Stratigraphic conclusions

The conodont data allows certain groups of samples to be grouped together to provide an indication of their stratigraphic age.

1. Samples SR1-SR15 contain early Llandoverian species of the Icriodella discreta-Icriodella deflecta Zone. Such taxa have been documented by McCracken and Barnes (1981) and Fahraeus and Barnes (1981) from the Becscie and Gun River formations of Anticosti. There is no indication of the distinctive conodonts of the Jupiter and Chicotte formations (Uyeno and Barnes,,1981, in press) and hence the well does appear to be spudded in the Gun River Formation.

2. Samples SR16-SR17 contain insufficient information.

3. Sample SR18 contains the first species to undisputed Ordovician age. Such taxa are known to range to within 50 cm above the Oncolitic Platform Bed (of Petryk, traceable across Anticosti Island) i.e., within Member 7 of the Ellis Bay Formation (of Petryk; = basal part of Member 6 of the Ellis Bay Formation of Bolton, Twenhofel and other earlier workers). The Ordovician-Silurian boundary (= approx. base of Becscie Formation) thus lies between 750 ft. and 850 ft. in the well, not at 1,275 ft. as shown on the log. - 4 - •

4. Other late Ordovician conodonts are present in samples below SR18 and Amorphognathus is a common form. Most specimens of this zonal genus are too fragmentary to identify the species, but in SR21, a more complete specimen indicates the level as-the Amorphognathus ordovicicus Zone. Samples SR19-SR38 contain tax a typical of late Middle and Upper Ordovician strata and similar to the fauna from the upper Vaureal Formation described by Nowlan and Barnes (1981).

5. SR39 was clearly from the Macasty Formation from lithological data but the conodont information is not diagnostic.

6. SR40 -SR41 are tentatively assigned to the Long Point Formation in the well log. The presence of Periodon cf. P. grandis indicates an age no older than middle Middle Ordovician age. Kennedy, Barnes, and Uyeno (1979) have shown that this species probably evolved from P.- aculeatus within the alobatus Subzone of the Amorphognathus tvaerensis Zone, i.e. mid-Caradocian; = Kirkfieldian; = age of Long Point Formation in western Newfoundland (Fahraeus, 1973; Barnes, Norford and Skevington, 1981).

7. Samples SR42-SR44 contain insufficient information.

8. Samples SR45-SR48 contain a distinctive assemblage of neurodont conodonts re- ferrable to Faunas 5 and 6 of Sweet, Ethington and Barnes, 1971. These are typical of the Blait River and particularly the Chazy Groups in Quebec, Ontario and New York State (= Llandeilian and early Caradocian). Such conodonts are known from unpublished studies from the type Mingan Formation to the north of Anticosti Island (of Chazyan age).

9. Samples SR49-SR57 contain insufficient information.

10. Samples SR58-62 contain a distinctive assemblage of conodonts typical of Fauna D of Ethington and Clark (1971) (= Prioniodus elegans Zone; Lower Arenigian; mid-Canadian; equivalent to upper Boat Harbour Formation of St. George Group of western Newfoundland). There is no doubt that this fauna is from the Romaine Formation (Lower Ordovician). Although data from SR63-SR65 were insufficient, it appears that the Romaine represents a small part of the Lower Ordovician compared to the more complete succession of the St. George Group in western Newfoundland. The Mingan-Romaine contact picked in the well could not be drawn any lower from the conodont data.

References

Barnes, C.R., Norford, B.S. and Skevington, D., 1981. The Ordovician System in Canada: Correlation chart and explanatory notes. International Union of Geological Sciences, Publ. No. 8, 27p., 3 figs., 1 chart.

Ethington, R.L. and Clark, E.C., 1971. Lower Ordovician conodonts in North America. Geol. Soc. Amer. Mem. 127, p. 63-82.

Fahraeus, L.E., 1973. Depositional environments and conodont-based correlations - of the Long Point Formation (Middle Ordovician), western Newfoundland. Can. J. Earth Sci., v.10, p. 1822-1833. •

Fahraeus, L.E. and Barnes,. C.R., 1981. Conodonts from the Becscie and Gun River Formation (Lower Silurian) of Anticosti Island, Quebec, In P.J. Lesperance (ed.), vol. II, Stratigraphy and Paleontology, Field Meeting, Anticosti-Gaspe, Quebec, 1981. Int. Union Geol. Sci., Subcommission on Silurian Stratigraphy and Ordovician-Silurian Boundary Wroking Group, Univ. de Montreal Press, 165-172.

Kennedy, D.J., Barnes, C.R. and Uyeno, T.T., 1979. A Middle Ordovician conodont faunule from the Tetagouche Gruop, Camel Back Mountain, New Brunswick. Can. J. Earth Sci., 16, 540-551

McCracken, A.D. and Barnes, C.R., 1981. and paleo- ecology of the Ellis Bay Formation, Anticosti Island, Quebec, with special reference to Late Ordovician-Early Silurian chronostratigraphy and the systemic boundary. Geol. Surv. Can. Bull. 329, Pt. II; 51-134.

Nowlan, G.S. and Bàrnes, C.R., 1981. Late Ordovician conodonts form the Vaureal Formation, Anticosti Island, Quebec. Geol. Surv. Canada Bull. 329, Pt. I, 1-49.

Sweet, W.C., Ethington, R.L. and Barnes, C.R., 1971. North American Middle and Upper Ordovician conodont faunas. In "Symposium on Conodont Biostratigraphy" W.C. Sweet and S.M. Bergstrom (eds.). Geol. Soc. Amer. Memoir 127, 163-193, 2 Pls., 3 figs.

Uyeno, T.T. and Barnes, C.R., 1981. A summary of Lower Silurian conodont bio- stratigraphy of the Jupiter and Chicotte Formations, Anticosti Island, Quebec. In P.J. Lesperance (ed.), vol. II, Stratigraphy and Paleontology, Field Meeting, Anticosti-Gaspe, Quebec, 1981. Int. Union Geol. Sci., Subcommission on Silurian Stratigraphy and Ordovician-Silurian Boundary Working Group, Univ. de Montreal Press, 173-184.

Christopher R. Barnes Professor and Head Department of Earth Sciences Memorial University of Newfoundland St, John's, Newfoundland A1B 3X5 (709-737-8143) December 13, 1982 70r,ang /gb r;Qng Sce : 2 )83r;ang - 290 plans 3 23 piers - 4/0C puts I/3D p1è728 - 90 eons scf-2 SI Z5 p;,to5 - 62r5 r~ns? Sc 2 ; ~ G.25 p,ii4 - 662.5- pietz., ~ h~a~ JtZ ~ ?/0 p%0P4 - 1-1a 8 q110 0e03 ~-~ 1,9 0r>s' 502: 9 - S3( 5ce; / 0 ?CO r'aw -- gSc3 Sc12:11 83D e - 6-0 row 12,/Z 760 r.oM - ryy parLP Sc12 : ) 3 89a ?)4 - 92z) p-an„ 92.0 eiang - )3o

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Department of Earth Sciences Telex: 016-4101 Tel.: (709) 737-8142

December 15, 1982

Dr. Rene Monjo Chief Geologist SOQUIP Place d'Lberville deux 1175 Rue de Lauigerie C.P. 10650 St. Foy, Quebec

Dear Dr. Monjo:

In reply to your letter of September 21, 1982, and late receipt of the well samples, I am enclosing the Final Report on conodonts from the SOQUIP - Scurry Rainbow Sandtop No.1 well, Anticosti Island. The Interim Report was sent to you on November 17, 1982. I trust that the Final Report is satisfactory, should you require further information or clarification please contact me. Conodonts have proved to be present in most of the well samples and provide good biostratigraphic control. Had the well cuttings been coarser, there would have been less fracturing of specimen and better taxonomic and biostratigraphic resolution.

I attach a statement for the costs incurred in this project.

I hope the seismic program was successful this summer. I remain puzzled why more drilling has not been attempted to the south and east of Anticosti Island in the Gulf of St. Lawrence. I will be interested in undertaking further conodont work on well samples should new offshore or onshore drilling be undertaken in the future.

Yours sincerely,

C ristopher R. Barnes Professor & Head

CRB:jIh Encl. 1