the stratigraphy of the upper bathonian to middle

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loidal or oolitic packstone facies. The top of this unit is marked by a thin ...... Middle-Upper Jurassic oolitic ironstone level in the Ibe rian Range (Spain): custatic ...

Rivista Italians di P a l c o n t o l o g i a e Stratigrafia

no. 1

v o l u m e 110

pp. 191-200

A p r i l 2004

THE STRATIGRAPHY OF THE UPPER BATHONIAN TO MIDDLE OXFORDIAN SUCCESSION OF THE ARAGONESE BRANCH OF THE CORDILLERA IBERICA (SPAIN) AND ITS EUROPEAN CONTEXT

1

2

K E V I N N. P A G E , J U L I A B E L L O , M A R I A D O L O R E S 2

GUILLERMO MELENDEZ ,

Received

Key words:

September

Jurassic, Bathonian, Callovian, Oxfordian,

JAVIER RAMAJO , & H A S S A N

19, 2002; accepted

ammo­

nites, stratigraphy, C o r d i l l e r a Iberica, A r a g o n , Spain. Abstract.

The Upper Bathonian-Middle Oxfordian

October

2

LARDIES ,

2

ZIANI

2

4, 2003

(Lardies et al. 1 9 8 8 ) . T h i s a c t i v i t y led t o the e s t a b l i s h m e n t o f t w o w e l l - d e l i m i t e d s e d i m e n t a r y r e a l m s : a s o u t h eastern

succession

area c h a r a c t e r i s e d b y g r e a t s t r a t i g r a p h i c a l c o n d e n s a t i o n

of ihe Aragonese branch of t h e C o r d i l l e r a Iberica is o n e of t h e m o s t

and a n o r t h w e s t e r n area, w h e r e s e q u e n c e s are r e l a t i v e l y

completely developed in Europe a n d i n c l u d e s localities of i n t e r n a t i o n a l

expanded due to a higher terrigenous input. The region

importance for J u r a s s i c b i o - and c h r o n o s t r a t i g r a p h y . O f p a r t i c u l a r i m ­

includes s o m e of t h e m o s t c o m p l e t e U p p e r B a t h o n i a n and

portance are a potential s t r a t o t y p e for t h e U p p e r B a t h o n i a n of N o r t h West Europe and reference s e c t i o n s for a n u m b e r of S u b m e d i t e r r a n e an Province M i d d l e Oxfordian b i o s t r a t i g r a p h i c u n i t s . T h e i n t e r v e n i n g

late M i d d l e - U p p e r O x f o r d i a n s e q u e n c e s

k n o w n in Eu­

r o p e . C a l l o v i a n and L o w e r O x f o r d i a n s u c c e s s i o n s are, in

Callovian sequence, albeit locally s t r o n g l y c o n d e n s e d , also includes fau­

c o n t r a s t , t y p i c a l l y h i g h l y c o n d e n s e d , w i t h the l a t t e r s u b -

nas of key stratigraphical i m p o r t a n c e . T h e s e q u e n c e of s t r a t i g r a p h i c a l l y

stage l o c a l l y a b s e n t . T h e y n e v e r t h e l e s s f r e q u e n t l y y i e l d

important a m m o n i t e faunas for this interval is here reviewed a n d placed

rich a m m o n i t e

in its European context.

faunas w h i c h p r o v i d e a d e t a i l e d

insight

i n t o t h e p a l a e o g e o g r a p h i c e v o l u t i o n of t h e I b e r i a n Basin d u r i n g t h e late M i d d l e a n d e a r l y U p p e r J u r a s s i c .

Riassunto.

La s u c c e s s i o n e del B a t h o n i a n o s u p e r i o r e - O x f o r T h e s e s u c c e s s i o n s w e r e d e p o s i t e d o n a s h a l l o w epi­

diano medio del ramo a r a g o n e s e della C o r d i g l i e r a Iberica e una delle piu complete e sviluppate in Europa, ed i n c l u d e localita di i m p o r t a n z a

continental

carbonate platform bounded

iniernazionale per la b i o - e c r o n o s t r a t i g r a f i a del G i u r a s s i c o . Di par-

north

and

ticolare importanza sono un p o t e n z i a l c s t r a t o t i p o p e r il B a t h o n i a n o superiore dell'Europa n o r d - o c c i d e n t a l e e delle s e z i o n i di r i f e r i m e n t o

west

connected

n o r t h east

on

by Palaeozoic

the

west,

massifs

but

b y a n a r r o w m a r i n e s e a w a y (the "Soria Sea­

per numerose unita b i o s t r a t i g r a f i c h e m e d i o - o x f o r d i a n e della P r o v i n c i a

way")

Submcditerranea. A n c h e I'interposta s e q u e n z a calloviana, s e b b e n e l o -

A q u i t a i n e Basin. To the east and s o u t h east, t h e A r a g o n e s e

calmente molto c o n d e n s a t a , i n c l u d e faune di i m p o r t a n z a chiave per la

P l a t f o r m w a s o p e n t o t h e S u b m e d i t e r r a n e a n P r o v i n c e in­

stratigrafia. La s e q u e n z a di faune ad a m m o n i t i s t r a t i g r a f i c a m e n t e i m -

t o t h e C a n t a b r i a n Basin in t h e n o r t h and hence the

fluences of the w e s t e r n Tethys - a l t h o u g h separated by

portanti per questo i n t e r v a l l o v i e n e qui passata in rassegna e posta in the shallow, t e m p o r a r i l y emergent

un contesto europeo.

"Maestrazgo

High"

f r o m t h e " T o r t o s a P l a t f o r m " o f t h e " C a t a l a n Basin", i m ­ m e d i a t e l y t o t h e east (Fig. 1 ) . T h e p r e s e n t s t u d y has been developed t h r o u g h a detailed analysis of a m m o n i t e suc­ Introduction

The U p p e r B a t h o n i a n t o M i d d l e O x f o r d i a n

c e s s i o n s in n u m e r o u s s e c t i o n s a l o n g a N W - S E b a n d of suc­

cession of the C o r d i l l e r a I b e r i c a in A r a g o n ( n o r t h east Spain) is characterised b y v e r y v a r i a b l e s u b s i d e n c e rates as a consequence o f b l o c k f a u l t i n g o f t h e s e d i m e n t a r y basin

1

J u r a s s i c o u t c r o p s f o l l o w i n g t h e n o r t h e a s t e r n m a r g i n of C o r d i l l e r a Iberica. T h e main localities s t u d i e d in the a r ­ ea are V e r u e l a , T a l a m a n t e s and Ricla in t h e n o r t h w e s t ; A g u i l o n , T o s o s and A l a d r e n in t h e c e n t r a l area, s o u t h o f

School of Earth, O c e a n a n d E n v i r o n m e n t a l S c i e n c e s , U n i v e r s i t y of P l y m o u t h , D r a k e C i r c u s , P l y m o u t h P L 4 8 A A , U K ( K P ) . E-mail: K e v i n P @ b e l l o - p a g e . f s n e t . c o . u k,

2

Paleontologia, D p t o . G e o l o g i a , U n i v e r s i d a d de Z a r a g o z a , c . / Pedro C e r b u n a 12, 5009 Z a r a g o z a , Spain. E-mail: g m e l e n d e @ p o s t a . u n i z a r . e s , j b e l l o @ p o s t a . u n i z a r . e s , r a m a j o @ p o s t a . u n i z a r . e s ,

;

[email protected] posta.unizar.es

K. N. Page, J. Bella,

192

M. D. Lardies,

G. Melendez,

J. Ramajo

& H.

Ziani

Mesozoic

«Paleogene

• Fig. 2

Neogene & Quaternary

- G e o l o g i c a l map of the s t u d y area in the A r a g o n e s e branch of the Iberian C o r d i l l e r a s h o w i n g the location of key localities.

catilis C h r o n o z o n e , Paturattcnsis S u b c h r o n o z o n e (Fig. 3) (Lardies 1 9 8 8 ; M e l e n d e z 1 9 8 9 ; A u r e l l et al. 1 9 9 4 ) . Fig. 1

- P a l a e o g e o g r a p h i c a l r e c o n s t r u c t i o n of the n o r t h - e a s t e r n Ibe­ rian ( A r a g o n e s e ) platform for the late Bathonian to M i d d l e O x f o r d i a n interval.

The Middle Oxfordian, Transversarium C h r o n o ­ zone

is

marked

by

the

widespread

development

of

s p o n g e - l i m e s t o n e facies of the Y a t o v a F o r m a t i o n (Melen­ d e z 1 9 8 9 ) , m a r k i n g a r e t u r n t o m o r e u n i f o r m conditions t h r o u g h o u t the A r a g o n e s e P l a t f o r m . Rich a m m o n i t e suc­ Z a r a g o z a ; M o n e v a and A r i f i o ( B a r r a n c o de las Estacas) in t h e area of Sierra de A r c o s ( s o u t h w e s t of Z a r a g o z a ) ; and C a l a n d a and Rafales in the e x t r e m e s o u t h east, c l o s e t o t h e T o r t o s a P l a t f o r m in C a t a l o n i a (Fig. 2 ) .

cessions f r o m these and succeeding O x f o r d i a n facies have been crucial t o t h e d e v e l o p m e n t of a refined z o n a t i o n for t h e late M i d d l e and U p p e r O x f o r d i a n of the Submediterranean P r o v i n c e .

T h e late B a t h o n i a n t o C a l l o v i a n sequence of n o r t h w e s t e r n areas, as typified by the localities of Ricla and A g u i l o n , is d o m i n a t e d b y l i m e s t o n e - m a r l r h y t h m s of t h e C h e l v a F o r m a t i o n , which in this area ranges u p t o the U p ­ per C a l l o v i a n . A l t h o u g h m i n o r n o n - s e q u e n c e s can be r e c ­ ognised, the succession is relatively c o m p l e t e and includes

T h e aim of this paper is t o p r o v i d e a stratigraphi­ cal r e v i e w of the succession of a m m o n i t e associations re­ c o r d e d in the A r a g o n e s e b r a n c h of t h e C o r d i l l e r a Iberica and t h e i r l i t h o s t r a t i g r a p h i c a l c o n t e x t and t h e r e b y dem­ o n s t r a t e t h e i r p o t e n t i a l f o r w i d e r c o r r e l a t i o n , especially international.

a p o t e n t i a l U p p e r B a t h o n i a n s t r a t o t y p e , o r r e f e r e n c e sec­ tion, at A g u i l o n . To the s o u t h east, h o w e v e r , a c o n s i d e r ­ able stratigraphical thinning takes place, a l t h o u g h the d e ­ v e l o p m e n t of a thick b l o c k of massive bedded, pale grey t o w h i t e limestone in the early U p p e r Bathonian ( Q u e r c i -

Lithostratigraphic framework T h e standardised l i t h o s t r a t i g r a p h i c f r a m e w o r k for

nus S u b c h r o n o z o n e ) of the A n d o r r a - A r i n o - C a l a n d a ar­

t h e M i d d l e and U p p e r J u r a s s i c c a r b o n a t e units of the

ea is characteristic. O v e r l y i n g the l a t t e r unit, is a latest

s t u d y area is t h a t established b y G o m e z & G o v ( 1 9 7 9 )

B a t h o n i a n - M i d d l e C a l l o v i a n sequence, ranging f r o m late

with m i n o r modifications by subsequent a u t h o r s (e.g. Au­

R e t r o c o s t a t u m t o A n c e p s , o r locally, l o w e r C o r o n a t u m

rell 1 9 9 0 ) . B a t h o n i a n t o C a l l o v i a n deposits f o r m part of

C h r o n o z o n e ( M e l e n d e z et al. 2 0 0 2 ) characterise a rela­ tively thin sequence

of b e d d e d l i m e s t o n e s ,

often

with

a b u n d a n t a m m o n i t e s , but also w i t h levels containing fer­ r u g i n o u s o o l i t h s and even glauconite. This sequence

is

t e r m i n a t e d , as it is t o the n o r t h w e s t , by a thin sequence of f e r r u g i n o u s o o l i t h - p a c k e d l i m e s t o n e s , often w i t h mtraclasts and r e e l a b o r a t e d (i.e. t a p h o n o m i c a l l y r e w o r k e d ; F e r n a n d e z - L o p e z , 1 9 8 4 , 1 9 8 5 ) fossils indicating ages rang­ ing f r o m U p p e r C a l l o v i a n t o early M i d d l e O x f o r d i a n Pli-

the C h e l v a F o r m a t i o n , a c a r b o n a t e unit spanning the en­ tire M i d d l e Jurassic, f r o m Aalenian o r u p p e r m o s t Toarcian t o U p p e r C a l l o v i a n o r l o w e s t M i d d l e O x f o r d i a n (Melen­ d e z 1 9 8 9 ) . This unit is w i d e s p r e a d t h r o u g h o u t the Ibe­ rian ( A r a g o n e s e and C a s t i l l i a n ) p l a t f o r m s and includes a thick ( 2 0 t o 3 0 0 + m ) , s o m e w h a t u n i f o r m succession of r e g u l a r l y b e d d e d l i m e s t o n e s , in units ranging f r o m tens of c e n t i m e t r e s t o several m e t r e s thick. O c c a s i o n a l interbeds of argillaceous s i l t s t o n e and marl are m o r e common

Stratigraphy

ZONATION

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of the Cordillera

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J.2.3

| Widespread stratigraphic gap

I"'ig. 3

I

| Bioclastic (wckest-packst.) sponge limestone (YATOVA Fm.)

- C o r r e l a t i o n of the main facies of the late M i d d l e to e a r l y U p p e r J u r a s s i c s u c c e s s i o n s of the A r a g o n e s e branch of the Iberian C o r d i l l e r a .

and important in n o r t h w e s t e r n areas w h e r e t e r r i g e n o u s

l i m e s t o n e beds (tens of c e n t i m e t r e s in thickness) w i t h ar­ gillaceous and marl i n t e r c a l a t i o n s , generally ranging f r o m

input was higher. To the s o u t h - e a s t , h o w e v e r , in t h e Sierra de A r c o s

B i f u r c a t u s t o B i m a m m a t u m c h r o n o z o n e . In the s t u d y ar­

area, there is a g r e a t e r d e v e l o p m e n t of bioclastic t o pel-

ea t h e l a t t e r unit is g e n e r a l l y 1 0 t o 2 0 m thick, a l t h o u g h

loidal or oolitic p a c k s t o n e facies. T h e t o p of this unit is

in t h e s o u t h e a s t e r n s e c t i o n s near C a l a n d a , it m a y be r e ­

marked by a thin ( 1 5 - 2 0 t o 8 0 - 1 1 0 cm) d e v e l o p m e n t of

duced t o o n l y 3 - 4 m. In t h e Sierra de A r c o s region, be­

yellowish limestone c o m p r i s i n g several l e n t i c u l a r layers

tween M o n e v a , A r i n o and A n d o r r a and f u r t h e r south east,

with ferruginous o o l i t h s and k n o w n as t h e " A r r o y o f r i o

s p o n g e s are r e s t r i c t e d t o t h e l o w e r unit of the f o r m a t i o n

Bed". This level includes an i m p o r t a n t s t r a t i g r a p h i c d i s ­

and the u p p e r interval is f o r m e d b y a pelloid and m a r k e d l y

continuity which m a r k s the C a l l o v i a n - O x f o r d i a n b o u n d ­

glauconitic p a c k s t o n e . T h e age of this f o r m a t i o n ranges

ary and a stratigraphic gap of variable range ( A u r e l l et al.

f r o m l o w e r T r a n s v e r s a r i u m C h r o n o z o n e (Parandieri t o

1994). North west of t h e A g u i l o n - A l a d r e n r e g i o n , this

Luciaeformis S u b c h r o n o z o n e ) to uppermost Oxfordian

bed is progressively replaced b y a 2 5 t o 4 0 cm thick, black

(Hauffianum

mudstone to w a c k e s t o n e w i t h p r o t o g l o b i g e r i n e

t o l o w e r Planula C h r o n o z o n e ) . In n o r t h

(Glob-

w e s t e r n areas, in the Veruela-Talamantes and Ricla sec­

uligenna) remains and c o m m o n a m m o n i t e s . T h e latter are

t i o n s , t h e u p p e r levels of this f o r m a t i o n s are replaced by

generally preserved as r e e l a b o r a t e d e l e m e n t s

siliceous s a n d s t o n e s o r calcarenitic l i m e s t o n e s and argil­

(fragmented

internal moulds and phosphatic m o u l d fragments) of U p ­ per Callovian and L o w e r O x f o r d i a n age, f o r m i n g a mixed

t h e e x t r e m e n o r t h w e s t (Veruela area), s h o w s a dramatic

and condensed r e c o r d e d association. Above this i m p o r t a n t and widespread discontinuity, Middle to U p p e r O x f o r d i a n d e p o s i t s are r e p r e s e n t e d by sponge-limestones (bioclastic f o s s i l i f e r o u s

laceous s i l t s t o n e d e p o s i t s of the A l d e a l p o z o F o r m a t i o n . T h e l a t t e r unit, w h i c h can reach a thickness o v e r 5 0 m in t h i c k n e s s r e d u c t i o n in t h e v i c i n i t y of Ricla , t o o n l y 5 t o 1 0 m, and q u i c k l y w e d g e s o u t t o the s o u t h east.

wackestone)

of the Yatova F o r m a t i o n . This u n i f o r m l i t h o s t r a t i g r a p h ­ ic unit is widespread t h r o u g h o u t the Iberian p l a t f o r m s

Chronostratigraphy and ammonite faunas

and normally c o m p r i s e s t w o lithological i n t e r v a l s (Fig. 3): a lower interval (2 t o 5 m) f o r m e d b y massive s p o n g e

Upper Bathonian (KP)

limestone banks, f r e q u e n t l y s h o w i n g the

development

T h e d i s c o v e r y o f a r e m a r k a b l y e x p a n d e d and a m ­

of sponge b i o h e r m s , and g e n e r a l l y c o r r e s p o n d i n g t o t h e

m o n i t e - r i c h sequence of alternating marls and limestones

Transversarium C h r o n o z o n e and an u p p e r i n t e r v a l , char­

in the U p p e r B a t h o n i a n of A r a g o n , n e a r A g u i l o n , facili­

acterised by a lesser d e v e l o p m e n t of b i o h e r m s and regular

tated a r e v i e w o f t h e S t a n d a r d Z o n a t i o n o f the substage

194

K. N. Page, J. Bello,

1 Stage |

Chronozone

Subchronozone

DISCUS

Hollandi/

I

Discus

1

1

M. D. Lardies,

Horizons

G. Melendez,

J. Ramajo

Rctrocostatum C h r o n o z o n e , Quercinus Subchronozone.

|

M e l e n d e z 2 0 0 0 ) . A m m o n i t e a s s o c i a t i o n s : c o m m o n large Procerites

|

gr. quercinus

Discus

sensu Arkell ? n o n T e r q u e m & J o u r d y , with s o m e

timorpbitcs,

Probecticoceras




nil.

ps.

Transvcrsarium

hi I'. I ransv.

I r;ms\.

I'rans\.

Fig. 7

- C o r r e l a t i o n o l kev O x l o r d i a n s u c c e s s i o n s on the n o r t h - e a s t e r n margin ot t h e Iberian C o r d i l l e r a ( A r a g o n c s c P l a t f o r m ) ; note the marked increase in t h i c k n e s s a n d clastic c o n t e n t of n o r t h - w e s t e r n

involute l o r m , P. (Dicbotomoceras)

duongi

areas.

M e l e n d e z in the u p p e r part,

Concluding

remarks

c h a r a c t e r i s e s a U u o n g i H o r i z o n . A l s o c h a r a c t e r i s t i c ol this u p p e r level is Passendorferia

torcalcnse

( K i l i a n ) ( [ M ] and [ m ] ) . R e c o r d s i n c l u d e :

Ricla (levels 50 and 5 5 ) , M o s c a r d o n and Frias de Albarracfn in e q u i v a ­ lent (levels 50 to 5 6 ; C a r i o u et al. 1991). C o m m e n t : in south eastern, external areas ( M o n e v a , Arifio and C a l a n d a ) w h e r e the O x l o r d i a n facies

T h e U p p e r B a t h o n i a n t o M i d d l e O x f o r d i a n succes­ s i o n o f t h e A r a g o n e s e b r a n c h of t h e C o r d i l l e r a Iberica is o n e o f t h e m o s t c o m p l e t e l y d e v e l o p e d in E u r o p e and i n ­

are relatively c o n d e n s e d facies, t h e s u b c h r o n o z o n e is r e p r e s e n t e d o n l y

c l u d e s localities of i n t e r n a t i o n a l i m p o r t a n c e f o r Jurassic

by reelaborated s p e c i m e n s in t h e l o w e r pari of o v e r l y i n g u n i t s .

b i o - and c h r o n o s t r a t i g r a p h y , i n c l u d i n g a p o t e n t i a l stra­

G r o s s o u v r e i S u b c h r o n o z o n e . C h a r a c t e r i s e d b y c o m m o n P. (Di­

t o t y p e f o r t h e U p p e r B a t h o n i a n of N o r t h W e s t Europe

Hori­

and r e f e r e n c e s e c t i o n s f o r a n u m b e r of Submediterranean

cbotomoceras)

spp.. A m m o n i t e a s s o c i a t i o n s i n c l u d e : G r o s s o u v r e i

zon (with AT. (D.) grossouvrei Per. Per.

(D.) bijurcatus (Amptbillia)

cf. malmtrwskae

l o r n i s i n c l u d e Ocbeloceras ria ex gr. teresijormis

Siemiradzki), Bilurcatus Horizon (with

( Q u e n s t e d t ) ) , M a l i n o w s k a e H o r i z o n ( w i t h small Brochwicz-Lewinski ) .

ex gr. raixense

- basseae

P'radin,

B r o c h w i c z - I . e w i n s k i - uptomoides

Passcndorje-

I'.nav ( t h e latter

already s h o w i n g features i r a n s i s t i o n a l to Ortbospbmctes) rosia

Associated

and

Sequei-

spp. M e l e n d e z ( M e l e n d e z & F o n t a n a , 1993; R a m a j o et al., 1 9 9 9 ) .

R e c o r d s include: the s u b c h r o n o z o n e i s well developed t h r o u g h o u t t h e A r a g o n e s e Platform and also i n the central and s o u t h e r n Iberian C o r ­

P r o v i n c e , M i d d l e O x f o r d i a n b i o s t r a t i g r a p h i c units. The intervening Callovian sequence, although often very in­ complete

and s t r o n g l y c o n d e n s e d , also includes assem­

blages o f s t r a t i g r a p h i c a l and t a x o n o m i c has t h e studies

potential of

the

to

make

geology

i m p o r t a n c e and

i m p o r t a n t c o n t r i b u t i o n s to

and p a l a e o n t o l o g y

m e d i t e r r a n e a n P r o v i n c e in E u r o p e

of

the Sub-

(Fig.7).

dillera ( C a s t i l l i a n P l a t f o r m ) . T h e unit is best e x p o s e d at R i c l a , Tosos and A g u i l o n ( o u t c r o p s Ag.4 and A G . 5 ) , a l t h o u g h i n eastern, m o r e e x ­

Acknowledgements.

T h i s w o r k is a c o n t r i b u t i o n to the Projects

ternal areas (Arifio, C a l a n d a , e t c . ) . it is c h a r a c t e r i s e d b y reduced a n d

BTF, 2000-1 148 ( M C T - C S I C ) and O T R I 2 0 0 0 - 4 4 8 (Fundacion Con-

incomplete condensed

j u n t o P a l e o n t o l o g i c o de T e r u e l ) . T h a n k s are due to the I n s t i t u t o de I;s-

s e q u e n c e s ( M e l e n d e z , 1989). C o m m e n t s : the

succeeding A r i n i e n s i s I Iorizon o f M e l e n d e z & F o n i a n a ( 1 9 9 3 ) , d e l i n c d

tudios T u r o l e n s e s , C S I C ( I ) i p u t a c i o n Provincial, Teruel) l o r linancial

on the basis ol Ortbospbinctes

(Melendez)

s u p p o r t . T h e a u t h o r s w o u l d also like to thank the reviewers J . C.ir.ic-

is n o w c o n s i d e r e d to be basal h o r i z o n H v p s e l u m C h r o n o z o n e ( U p p e r

ucl a n d I. l-'ozy for their critical reviews and s u g g e s t i o n s that improved

O x l o r d i a n in a S u b m e d i t e r r a n e a n s e n s e ) .

the

[ex. Passendorjeria]

ariniensis

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Iberica

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