Harris, Colin Stuart

English

The microfauna (foraminifera and Ostracoda) of the Albian Stage has been thoroughly documented by previous authors and many zonal schemes have been proposed. While these schemes have been defined on very thorough research, the majority have been defined on one fossil group, and occasionally on one genus or several genera. This project attempts to refine the existing zonation based on foraminifera, to correlate it with the existing Ammonite zonal scheme, and propose a detailed zonation based on Ostracoda which have been integrated with both the zonal schemes mentioned above. To achieve this, the stratigraphically most continuous sections were examined

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(1890) figured specimens of this species from the Gault Clay of Folkstone and the 'chalk detritus' of Charing.

(p1.4,figs.l-3) 1892b Bi.ilimina obliqua d 'Orbigny;Chapman:

(p1.6,fig.6.) l894a Vaginulina strigillata Reuss;Chapman:423,pl.8,figs.Ja,b,4

(pl. 114,fig.l.) 1965c Polycope oweni Kaye: 222, pl. 4, figs .ll-15 Diagnosis: A small, subc:i.rcular species strongly reticulated surface.

(pl.2,figs.3,4.) 1880 Gaudryina filiformis Berthelin :25 ,pl. I, figs .Sa-d 1892b Gaudryina fil'iformis Berthelin;Chapman: 752 ,pl. 11, fig. 7 I 1937a Dorothi:a filiformis (Berthelin);Cushman:73,p1.8,figs.I,2

(pl.26,fig.9) 1965c Neocythere (Physocythere) tenuis Kaye:245,pl.6,figs.l4-17

(pl.3l,figs.11,15,16) 1964b Eucy.therura mu ltitubercuiata Griindel: 7 48,p 1. 2, figs. 12,13 1964a Eucytherura ansata Weingeist;Kaye:97,pl.4,figs.1-4

(pl.4,figs.4-9,12.) 1892b Bulimina presli Reuss;Chapman:755,pl.l2,fig.l4 1:892b Bulimina orbignyi Reuss ;Chapman:

(pl.6,fig.l2.) 1880 P1eurostomella reussi Berthelin:28,pl.l,figs.l0a,b,ll,l2 1880 Pleurostomella obtusa Berthelin:29,pLl,figs.9a,b 1892b Pleurostomell'a obtuse Berthelin:;Chapman :757 ,pl. 12, figs .13a ,b 1892b Pleurostomella alternans

(pl.l4,figs.2,6.) 1963b Cytherella speetonensis Kaye:112,p1.18,figs.7,8 ?1977 Cytherella gr. parallela (Reuss) ;Charollais et, al.:pl. 1 ,fig.

(pl.l6,fig.5) 1965c Pontocyprella semiquadrata Kaye:224,pl.3,figs.l-8

1:5 Controls of deposition Owen

1967/1, 113/2, 3/1 (all U4's) .. Folkestone: IIa (U4's). Southern North Sea Basin: 49/24-1, 49/19-1 (well cutting samples).

22, figs .12-lB;pl. 23,figs .1-3) 1893 Cythereis triplicata var.lineata Chapman & Sherborn:348,pl.l4, fig.5 1938a Protocythere j one si Triebe 1: 186, pl.l,

3:7) These four boreholes (U.4's) were sunk in the Sevenoaks, Kent area in 1969 by Kent County Council Highways Department in a - 39 -Fig. 3:5 A detailed lithological log of the Glyndebourne section showing the position of the sampling

3) Several sections collected by

4:2 The width/height ratios of individual specimens of the genus Arenobuli mina. KIIGH'r 1.(1 -· 0.5 • 0 0.2 o •• - 89 -t.

7 Sub-family GUEHBELITRIINAE Montanaro Galli'telli,

8-80; pl.lO, fig. llO 1964c Platycythereis chapmani Kaye:69,pl.6,figs.l6,18,20 Diagnosis: A large species 'of Plat:z:c:z:thereis which has a frilly rib extending around the entire lateral margin in a lateral direction.

a-lso recorded an ammonite, Dimorphoplites cf. hilli from the Red Chalk, which they regarded as indic.ativ.e of a Middle Albian age.

All intermediates between these two forms occur. Previously

also recorded this ·species from the Aptian of the Isle of Wight and from the Albian of the Paris Basin. He noted that the Aptian and Albian specimens are morphologically identical.

An outline map of southern England showing the distribution of the major sampling localities. I

and Grunde'l

and Magniez-Jannin

and Mou1:lade

and,Weaver (MS.) noted that the British - 281 -specimens cif' this species differ from those descr:i!bed ·by Triebel

Another model for the change in the sea depth during the Cretaceous was proposed by

Arenobulimina franked Cushmana7,pl.4,figs.5a,b 1937a Arenobulimina- frankei Cushman·;C\lshman:37,pl.4,fig.21

At about this time in Britain Hughes-Clarke (MS.,

auritus Subzone in southern.England. In East Germany Grundel recorded this transition between the two species in the Middle Albian. This highly diachronous transition between !.lineata and P.striata Gri.indel,

b) A lack of understanding of the shallow epicontinenta·l sea environment. For these reasons the species concept utilised for the _ following planktonic species is based on that of B{(l977)

Ban cock The age of both the above mentioned facies is still problematical. These problems have recently been reviewed by

borehole .located 1270 yards

Cauville Pays de Caux (Seine Maritime), northwestern France (fig. 3:10) This coastal section was collected from the cliffs to the northeast of Le Havre, Pays de Caux which has previously been described by Owen (I971a), Juignet et.al.

Chapman (1894a;l57,pl.3,fig.l5) recorded a similar species from Bed xi at Folkestone which he attributed to Frondicularia lanceola Reuss,

Chapman (1898} noted that at Folkestone, from Bed i to Bed vii, specimens of this species gradually increase in size and numbers only to disappear fifty five feet from the top of the succession.

Chapman's figured specimen (B.M. no.P4572) is a typical member of the ~· chapmani plexus, and it was recorded from Bed X of Copt Point. This species has been very thoroughly discussed by subsequent authors .. Gawor-Biedowa

CHAPTER FOUR TAXONOMY: FORAMINIFERA Taxonomic Introduction The classification used in this-study is that described in the Treatise on Invertebrate Palaeontology, Part C,

CHAPTERS TAXONOMY: OSTRACODA Taxonomic Introduction The classification used is that descri!bed by Van Morkhoven

Cornicythereis I:arivourensis Damotte & Grosdidier;Van der Wiel: pl.l,figs .9, 10 Diagnosis: A small species. of Cornicythereis with a broadly rounded hinge ear. Length Height Width 271 L.V. Female 0.52m.m. 0.30 0.12 272 R.V.

Cushman originally placed this species in Hagenowella gen.nov. on the basis of intern8'l partitions and subsequently this genus has· been regarded as a junior synonym of the genus Arenobulimina. Carter & Hart

Cytherei:s thoerenensis Triebel:

Cythereis bonnemai Triebel;Neale:p1.12,figs.5,6 Diagnosis: A small, elongate, poorly inflated species of Cornicythereis with three poorly developed pointed ribs. Length Height Width 266 L.V. Female 0.59m.m.

Cythereis glabrella Triebe·l: 196 ,p1.6, figs .60-62 1964a Cythereis glabrella minuera Triebel;Gri.indel:746,pl.l,figs.l,2 1965c Cythereis glabrella Triebel; Kaye: 248, pl.lO, figs.

Cythereis lutmannae bemerodensis Triebe 1; Kemper: 39, pl.l,

Cytherelloidea circumvallata Bonnema ;Mertens:

Deroo

did not record this species from the Cenomanian of southern. England. Gr\indel

During the last de.cade, Hart (1973a,b),

During this study a large amount· of variation was r.ecorded in the strength and type of hingement in species of the genus Neocythere.

East Devon Several samples from the Chert beds/Lower Chalk contact were collected from this locality. This information has been published

ee o o og • o• o o o o Do •o8

England it has only been recorded from the M.rostratum Subzone. This species is of major, local, stratigraphic significance. Mandocythere muelleri (Grundel,

Eucythere trigona lis (Jones & Hind e) ;Triebel: 164, p 1. 1, figs. 4-9; p1.9,fig.l00 1956 Eucythere trigonalis (Jones & Hinde) ;Mertens :199,pl.ll,figs. 56-58

figs. 90-93 Diagnosis: A compressed, elongate, species of Vaginulina.

figured a strongly conical form of D. trochus. She also stated that this has a similar stratigraphic range to ~.cretosa, which al·though externally similar, possesses internal.

first described this species from the _!!.minimus Zone of northwest Germany. Since this description,~.lurmannae, has been documented frequently but poorly understood.

first recorded this species from the N.minimus Zone of. Germany. Grundel

further confused this species with the application of the concept of form groups. He figured many specimens (pl.4,figs.2-8) which are very similar to the original figures of Damotte and Grosdidier

Gawor'-Biedowa 09.72) stated that the Polish specimens conformed in alii respects .to the holotype of ~.cenomana (Keller,

Gen\ls Monoceratina Roth,

Genus :Dolocythere Mertens,

Genus Arenobulimina Cushman,

Genus Argilloecia Sars, 1866 Type species: Argilloecia. cylindrica Sars, 1866 Argill'oecia valvula Kaye,

Genus Belorussiella Akimez,

Genus Citharina d'Orbigny in De La Sagra,l839· Type species: Vaginulina (Citharina) strigillata Reuss, 1846 Citharina d'Orbigny Marie,

Genus Clithrocytheridea Stephenson,

Genus Conorboides Hofker in Tha•lmann,

Genus Cribratina Sample,

Genus Cytheropteron Sars, 1866 Subgenus Cytheropteron (Cytheropteron) Alexander,

Genus Cytherura Sars, 1866 Type species: Cythere gibba O.F.Miil:ler, 1785 Cytherura striatoides Bonnema,

Genus Gaudryina d'Orbigny in De La Sagra, 1839 Type species: Gaudryina rugosa d'Orbigny, 1840 ~.bulletta (Carsey,

Genus Gaverine11a Brotzen;

Genus Haplophragmoides Cushman,

Genus Hedbergella Bronnimann

Genus Heterohelix Ehrenberg, 1843 Type species: Spiroplecta americana Ehrenberg, 1844 Heterohelix moremani (Cushman,

Genus Macrocypris Brady, 1867 Type species: Cythere minna Baird, 1850 MacrocYPris sp. cf .~.siliqua (Jones, '_1870,) (pl.15.figs.l4,15;pl.l6,figs.l,2) 1849 Cythere (Bairdia) siliqua Jones :25,,pl. 5 ,figs .16a-d (non. figs. 16c-h) 1890 Macrocypris siliqua.

Genus Nodobacularia Rhumbler, 1895 Type species: Nubecularia ~

Genus Paracypris Sars, 1866 Type species: Paracypris polita Sars, 1866 Paracypris wrothamensis Kaye,

Genus Pseudotextulariella Barnard in

Genus Spiroloctilina d'Orbigny, 1826 Type species: Spiroloculina depressa Cushman,

Genus Valvulineria Cushman,,

Grundel (l966) record~d it from the basal Middle Albian of East'

have reviewed much of the existing knowledge on British Albian macrobiostratigraphy and have compared the dating of many of the major Albian sections.

He also recorded it from the Aptian. Kaye (MS.) recorded it. from just below the Greensand Streak at Speeton. He also. stated that at Speeton it is limited to the Lower Al:bian. Gri.indel

He recorded it as common in Bed X. Bignot

Ibis was originaHy suggested by

In England,the Albian has been divided into three Substages and these have been divided into Zones and Subzones based on Ammonoidea. This was achieved by the publication of a number of zonal schemes (Casey,

In his: detail:ed account of M:bi 1an stratigraphy,Van Hinte

In southern England this species was recorded from the upper Middle and' lower Upper Alb:ian while Magniez-Jannin

In this study it was recorded in the Red Chalk (Upper Albian) of the southern North Sea Basin. northern 'boreal' province. It has only been recorded from the Reticulate juveniles identical to H.reticulata Kaye,

Isoc:z:thereis, fortinodis reticulata Triebel;Grundel: 39 ,pl. 7, figs. 10,11 19Hb Isoc:z:thereis fortinodis Triebel ;Damotte': 79, pl. 4 ,fig.l2

It appears simiLar in outline to the largerMiddle Albian specimens of I.fortinodis.. It differs from I:_? magna Grundel,

It appears similar to Cythereis nuda Kaye,

It has been regarded as stratigraphically important by Price (1977b) who recorded it from the !!_.spathi Subzone to the ~.cristatuui Subzone. Carter & Hart

It has subsequently been recorded· from the Middle and Upper Albian of the Anglo-Paris Basin and from the Middle Albian of Holland. Both Price

It is common in the Cenomanian. Cytherella sp.cf._£.truncata (Bosquet, 1847) (pl.l~,£igs.7,8,10,11,12,13.) 1847 Cythere truncata Bosquet: 357, pl.l, figs. 2a-c 1971 Cytherella cf.

It was placed in the genus Citharinella by Marie

Kaye also placed this species· in the genus Protocythere while Neale

Albian microbiostratigraphy (foraminifera and Ostracoda) of S.E. England and adjacent areas

Albian microbiostratigraphy (foraminifera and Ostracoda) of S.E. England and adjacent areas

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