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厩 Magnetic Stages I6 勿 G . Pavia and R. Enay D efinition of the A alenian-B ajocian Stage boundary The G lobal boundary Stratotype Section and P oint brought to a conclusion in 1994 w ith the nom ination ot the M urtin- (G SSP) for the Bajocian Stage, formally defined at the heira section at C abo M ondego, Portugal, as the best outcrop for defining the G lobal boundary Stratotype Section and Point (G SSP) base of bed AB Il of the M urtinheira section at Cabo of the Stage. A ft er a positive ballot w ithin the B W G , the resolution M ondego (P ortugal), has been ratif ed ky the IU G S. M ul- w as subm itted to the C ongress ot the International Subcom m ission tidisciplinary biostratigrap hical data, m ainly based on on Jurassic Stratigraphy (ISIS) in M endoza, A rgentina, in O ctober, 1994. In addition to the G SSP , the selection of the B earreraig B ay am m onite and calcareous nannofossil assem blages, section on the Isle ot Skye, Scotland, as the A uxilia r y Stratotype assure w orldw ide correlations; m agnetostratigrap hic Point (A SP) w as also suggested as a com plem entary outcrop w here data increase the correlation p ow er The position of the the palaeobiological key (evolutionary transition w ithin the boundary coincides w ith the fi rst occurrence of the am m onite group G raphoceras-H yperhoceras) for recognizing the B ajocian low er boundary is finely represented. T he consensus at the am m onite assem blage characterized 勿 H yperhoceras M endoza m eeting encouraged subm ission oft he proposal of both the m undum and related species (H . furcatum , B ratinsina B ajocian G SSP and the A SP (Pavia and others, 1995) to the ISJS aspera, B . elegantula). The boundary lies just below the w hich unanim ously accepted the resolution. nanno-horizon of the entry of W au naueria com m unis T his paper gives details on the definitio n o t the B ajocian G SSP recom m ended by the IC S at the end 1995. T he proposal w as for- and W . fossacincta, and closely corresponds w ith an m ally ratified by the IU G S at the m eeting ot the E xecutive C om m it- inversion to norm al polarity correlated w ith the up -to- tee in January ］996. date Jurassic m agnetic p olarity tim e scale. A n A uxiliary Stratotyp e P oint (A SP ) is also selected at the base of b ed T he low er boundary of the B aJocian Stage U 10 of the B earreraig B ay section on the Isle of Skye, Scotland, as the comp lem entary referencefor the p alaeo- The original definition ot the B ajocian Stage dates back to 1850 biological key of the Bajocian lower boundary, i.e. the (d'O rbigny, 1842-5 1, p. 606, and 1849-52. pp. 477, 483; see R ioult, evolutionary transition G raphoceras-H yperhoceras. 1980 for references) w ith geographic references to B ayeux and the area around C aen, N W France. In the Jurassic C olloquium held in Luxem bourg, R ioult (1964) proposed the section at Sainte-H onorine- des-Pertes, near B ayeux, as the stratotype of the Bajocian Stage In tro d u c tio n H ow ever, Pavia (in C resta and Pavia, 1994, p. 93) observed that stratigraphic condensation and fossil rew orking dictate exclusion ot any section in the area of B ayeux as the stratotype of the Stage. M ultidisciplinary research on the boundary stratotype, developed O n the basis of am m onite fossil assem blages, the E uro p e a n over m any years by the B ajocian W orking G roup (B W G ), w as B ajocian presently com prises seven 'Standard Zones' (Figure 1), 厩 MP AO GL ANRE TITIYC S│ T A G E S │ E u r o p e a n│ S t a n d a r d Z o n e s │ │ │ │ │ │ │ 百 │ 日＾ 丁 。0 N│ I’ A N │ ││ │｝ │ U │ P a rk in e n n i-q n n r-k im z n n i 7 n n r- │ │ │ ├───────┤ │ │ 三 B 呈 │ f l'A rn │rd ia na m q ran fi an a 7│nnp│ │ │ │ │ ．． A │ │rE │ 4 Z t r ja n n │ i , ta r .q .,c z n i r i & P n .- z P 7 n np.│ │ │ ├───────┤I＿│ │ │ ││ │ │ 口．．． │ │ J R ├──────────────────────────────────┤ │ ├─┼─┤ 0 │ │ S t e│ p h │a├───────┤no ceras hum p hti e s│ian um Z on e │ 竺 C │ │ M ite s s a│uze i Z on e │ │ │ │ │ I L │ │ │ │ ├───────┤ │ │ ．门．． ．．． │ │ A 0 │ │ │ │ │ │ 冈 W │ │ │ ├───────┤ │ │ F ig u r e I B a j o c ia n a m m o n i t e │ E │ │ │ │ │ │ │ │ │ │ │W i│tch e fi a la e v iu s c u l│a Z o│n e S t a n d a r d Z│ o n e s i n E u r op e c o r re l a te d │ R │ │ ││ ├───────┤ │ w i th m a│gnetic p olarity tim e scale 州yperfioceras discites Zone│ │ │ (m o d ifi│ e d f r o m G r a d st ei n a n d│ o th e r│s , │ │ A A L E N I A、 │ ｛ 19│9 4; q 绍 ， 1 9 95│). │ │ M a rc h 1 9 9 7 Z 7 w hich have been tentatively correlated w ith the standard ones pro- I T he basal boundary of the H . discites Z one is m arked by an posed for the Pacific Realm (H illebrandt and others in W esterm ann, am m onite assem blage w hich contains the H . m undtan group 1992, p. 254). T he biochronological correlation pow er of the Euro- late representatives of G raphoceras and H aplop leuroceras: pean Standard Zones thus would spread out the palaeobiogeograph- other taxa. like E tihop loceras and H am m atoceratidae, did no t ical sectors w here they are usually recognized and applied. O ther seem so useful for stratotype definition because of w ide bios- bio stratig raphic zonal schem es are in progress, e.g. for calcareous tratigraphic range and low frequency in the Sub- M editerranea n nannofossils, palynom orphs, m oceram id bivalves and others (C resta sequ ence s. and Pavia, 1994 ）． 2 T he M urtinheira section w as provisionally regarded as the m ore T he B ajocian i s d ivided in tw o substages (Pavia in M ichelsen suitable candidate for G SSP w ith the B earreraig B ay section and Zeiss, 1984, p. 65). The European Lower Bajocian encom passes being considered as the auxiliary stratotype. the 4 vperhoceras discites to the Stephanoceras hum phriesianum 3 For these tw o sections, nevertheless, m ore inform ation on bio- Zones. The base of the 且 discites Z one is traditionally used to stratigraphy and m agnetostrati graphy w as to be done. determ ine the base of the substage. F or its recognition, in m any Jur- D uring the B W G m eetings of Portee in Scotland （199 1) and M a r- assic C olloquia (E rlangen 1984, L isboa 1987, Poitiers 199 1, M en- rakech in M orocco (1994) no agreem ent on a single proposal doza 1994) and related B W G m eetings (C resta and Pavia, 1990; w as reach ed . T h e d ile m m a w as that: M orton, 199 1; C resta and Pavia, 1994), the evolution of the I the Bearreraig B ay section is better for docum enting the evolu- am m onite fam ily G raphoceratidae has been stated as providing the tionary lineage w ithin the am m onite fam ily G raphoceratidae highest biostratj graphical resolution. In particular the first occur- and the early developm ent ot H 力,erlioceras} rence of species of the genus 尺yperlioceras, evolved from G rapho- 2 the M urtinh eira section is m o re suitab le fo r d irect corre lation ceras, has been largely accepted as being the biochronological event based on am m onite assem blages; w hich best enables recognition of the basal boundary oft he B aJocian 3 n o a lternativ e cand id ates had been sub m itted . Stage, particularly in the Sub-M editerranean and Sub-B oreal In a postal vote w ithin the BW G , a m ajority o f 6 5.7% favoured P ro vince s. M urtinheira. T he resolution to define the G SSP ot the B ajocian T he re c e n t usage m eans that the H . discites Z one is an A ssem - Stage in the M urtinheira section w as presented during the m eeting of blage Zone in the sense of the International Stratigraphic G uide (Sal- the ISJS (A rgentina. 1994); it w as also suggested that a joint pro- vador, 1994). It is m ainly characterized by species of the Cgenus posal be m ade for the B earreraig B ay section to becom e the B ajocian H yperlioceras. O n the basis of the m ore recent literature, the low er A S P .
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