Tài liệu STRATIGRAPHY AND AMMONITE FAUNA OF THE VOLGIAN AND BERRIASIAN ROCKS OF EAST GREENLAND ppt

MEDDELELSEK OM GRUNLAND

U1)GIVKE hF

ICOMMISSIONEN FOR VIDENSKAHELIGE UNDERSBGELSRH I GR0NLAND

BD. 154 . NR. 4

DE IIANSKE EKSPEDITIONER TIL DSTGRONLAND 1947-58

UNDER LEDELSE AF LAUGE KOCH

STRATIGRAPHY AND AMMONITE FAUNA

OF THE VOLGIAN AND BERRIASIAN ROCKS

OF EAST GREENLAND

BY

IIESMOND T. DONOVAN

WITH 3 FIGURES IN THF: TEXT

AND 9 Pl.A'CICS

K0HENHAVN

C. A. REITZELS FORLAG

BIANCO LUNOS BOCTHYKKERl A/S

1964

COKTENTS

PBYC

I'rrface ............................................................... 5

.ibstract .............................................................. 6

I . Introduction ..................................................... 7

IT . Thr localities and t. hcir stratigraphy ................................. 8

1 . Milne Land .................................................... 8

2 . Soutll-western Jorrlesun Land .................................... Y

3 . Northenr Wollastun Forland ..................................... 9

4 . Weslern Kuhn O ............................................... 1.1

5 . East. crn Kuhn M ............................................... 13

6 . The ammonite sequence ......................................... 13

111 . Correlation ....................................................... Ih

1 . Russia ........................................................ I4

2 . England .................................................... 16

3 . Conclllsions .................................................. 18

I\. . Systematic paloeontology .......................................... 19

1 .. Referrrlces tu litrruture ............................................ 32

I'KEFACE

ilrlng the summer of 1957, as a member of 1,nucc KOCH'S Expedi- D tion ' to East. Grrcrrland of that year, I was able to visit most of the

localities which are of importance for working out the latcst Jurassic anrl

earliest Cretaceous succession. The exceptions were soulh-wcstern Jame￾son Land, and castern Kuhn f3, which 1 was not able to reach. As a

result I have been ablc to review the rocks of this ago and bring ilp

to date their correlation, and this is the object of this paper.

I was accompanied by Mr. A. WYTTETRACII as field assistant, and

wish to thank him for his help. In Milne Land I also had the advantage

of the company of Dr. J. H. CALLOMON. 1 am indebted to Dr. LAUGK

I<oc~r and his secretary, Miss IXGRID BSCK, for discussion and for assi￾stance with publication.

I have had useful discussions on correlation with Dr. R. CASI:Y of

the Geological Survcy. Dr. hf. K. HOWARTH of tbc British MUSBIIIIL

(Natural History) has kindly supplied photographs ol arr~monites from

the Spilsby Sandstone. The olher photographs illustrating the papcrwere

taken by Mr. E. W. SJ~AVILL at Bristol University.

Bristol, July 1962.

Abstract

The localilirs al n-l~ich Lalr dnrlwsic and Lux~rr~nost Cretaceous rocks ha\-r

liven rnnnrl in nast Grwnland arc rcrirlrcd and some of tl~rrn redescribed T~P

higllest .lnrassic fauna is characterized I]>- the ammonite I,augrite.s, and is proba￾bly to he correlated~vitl~ the Lox\-er Volpian of Russia. There is no positive evidence

for the presence of UliperVolgian. Tl~rarlirsl Crelaceous fauna has thc am~nonites

Tollia, Srrrite.7 and Hertorocerns artrl vo~rrspurl<lr I,, llle Ryazanian of S~zo~nv or

Lu\vrr Valanginiatl or olhrr R~~ssian nt~tho~,s. ailll In ilrr Rrrriasian of ~rcstcrn

authors. Corrclaiion with thc English scquencc is also disrrrssecl.

The palaeor~tology of the im~~nonite genera Laupeites, Suril~s ancl Tollia is

Lreoled s~slr~n;rliiallq-. Tl~ree new sprcirs or Lnrrgrires uri. named, dcscrih~d and

ligurrcl.

Among the numerous illesozoic am~no~lile faunas collected by LAUGE

1Zoc~'s ~hree-year anil Two-Year Expeditions to East Greenland and

described by the late Dr. I,. F. SPATI] (see nol-ovx, 1957, PI). 1C-10)

were several helonging to littleknowrr horizons near tl~e top oI the Jnrassic

system anrl (,he base of the Cretaceous. Describing some of them SPATH

(1946, 1947, 1952) gave much attention to problems of dating and corrc￾lation, arrd t,o ll~e sequence of faunas rrcar thc Jurassir.-Crel,a(:eous

boundary. At one time (1947, 11. 8.) Ire had hopes that discoveries in

East Greenland might roake an important contribution to the problem

of defining the Jurassi1:-C~.etaceolls boundary and working out thc stm￾I,igraphy of thc beds immediately above and bclow. Thcsr: hopes have

not been i~~lfilled, and it is now cl<.ar, as will he shorn, that there is a gap

in t,he ammonite sequrxlr~e known from East Greenland as compared with

Europe and Russia. Since I attempted to summarisc tho question from

inadequate knowledge in 1957 (p. 142), I havc been able t,o visil most

of the 1or:;rlilies and collect fossils. Thcsc fossils are described and illu￾stratrtl in this paper, arul arrompanied by a review of stratigraphy arrd

<:orrelation.

In ad,lit:ion to my own collcctiuris, I have stu(lied material collected

at the Nirsen in Wollaston Forlanrl 11y A. J. STAXDRING and E. ITT.

RORERTS in 1952, and 11y F. PERREYOLID and 0. KOY in 1956.