View of CALCAREOUS PLANKTON BIOSTRATIGRAPHY OF THE SANTONIAN-CAMPANIAN BOUNDARY INTERVAL IN THE BOTTACCIONE SECTION (UMBRIA-MARCHE BASIN, CENTRAL ITALY)

S TA G E C C Zo n e (S iss in g h , 1 9 7 7 ) N C Zo n e. (B ra lo w er , 1 9 9 5 ) U C Zo n e (B u rn et t, 1 9 9 8 ) S am p le s (m ) A B U N D A N C E P R ES ER V A TI O N 233 F M R R R R R A F R R R R R R R R R F R R R 232.85 F P R R F R R F R R R F R A A R R R R R R R R R C R R R R R R R R R F R R R R 232.33 F M R F R R R R A A R R R R R R R R R 231.45 F P R R C F R R R R A A R R R R R R R F R R R R R R R R R F/R R 230.6 F P R R R F R R R C R R A A R R R R R R C R R R R R R R F R R R 229.75 F P R R F F R R F R R A A R R R F R R R R R R R R R R R R 229 F P R R R F R F R R R R A R A R R R R R R R R R R R R R R R R R R R R R R FO A. parcus constrictus 227.5 F P R R F R R F R R R R F A A R R R R R R R R R F R R R R R R R R R R R R R 227.3 F P R R R F F R R R R R F A A R R R R R R R R F R R R R R R R R R R R R R 226.55 F P R R R R F R R R R A A R R R F R R R R R R R R R R R R 225.75 C M R R R R R R R R R F R R A R A R R R R R R R R R R R R R R R R F R R R R R R R R

224.6 C P R R R R F R R F R R F R A A R R R R R R R R R R R R R R R R R R R R R R R FCO A. parcus parcus

223.92 C M R R R F R/F R R R A A R R R R R R R F R R F R 223.2 F M R R R F R R R F F R A A R R R R R R R R R R R R R R F R R R R 222.85 F P R R R F R R F R A C R R R R R R R R R R R R R R R R R R R R R 222 F P R F F R R R R A A R R R R R F R R R R R R R R R 221.95 F P R R F C R R R R C R A C R R R R R R R R R R R R R R R R R R R 221.9 F P F R F R R R R R R R R R R F/C R R R R F R R R R R R R 221.87 F M R R R R F R R R R F R R A C R R R R R R R R R F R R R R F R R R R R R R R R R R R 221.71 F P R R F F R R R R R A A R R F R R F R R R R R R R 221.6 C P R F/C R R R C R A A R R R R R R R R F R R R R R R R R R R R R R 221.45 F P R R R R R R A A R R R R R R R R R R R R R R R 221.4 F M R R R F F R R R R R R R R A R A R R F R R R R F R R R R R R R R R R R R R R R R R R R R R 221.3 F P R F R R R R R A A R R R R R R R R R R R R R R R R R R R R R R 221.1 F P R F R R F R R R R R R A A R R R R R R R F R R R R R R R R R R R R 220.9 F P R R R R C R R R R F R R A A R R R R R R R R R R R R R F R R R R R R R R R 220.5 F P R R R F F R R R R F R R A R A R R R R R R R R R F R R R R R R R R R R R R R R R R R R R R R FO A. parcus parcus 220.2 F P R R R F R R R R A A R R R R R R R F R R R R R R R R R 219.75 F P F R R R F R/F R R R F F R A A R R R R R R R R R R R R R R R R R R R R R 219.5 F P R R R F R R R R R R A C R R R R R F R R R R R R R FO A. parcus expansus 219.1 F P F R F F R R R R R R A A R R R R R R R R R R F R R R R R R R R R R R R R FO A. cymbiformis 218.92 F P R R R R R F F R R F R A A R R R R R R R R R R R R 218.4 F P R R R R F R R R F R R A A R R R R R R R R R R R R R R R R R R R 217.5 F P F R R F F R R R F A A R R R R R R R R F R F R R R R R R R 216.85 R P R R F R F R R R R R C F R R R R R R R F R R R R R R R R R 216.3 R P R R R R R R R R R A A R R R R R R R R R R 215.8 R P F R R R F R R R R R C C R R R R R R R R R R R R 215.45 R P R R R R F R R R F C C R R R R R R R R R 214.9 F M F R R F R R R R R R R A A F R R R R R R R R R R R R 213.8 R P F R R R R R R R F R C C R R R R R R R R R R R R R R 213.01 F P F R R R F R R R R R C C R R R R R F R R R R R 212.55 R P R R R F R R R F R C F R R R R R F R R R R R R R R 212.4 F P F/R R R R R R R R R F R A A R R R R R R R F R R R R R 212 F P R R F R R R R R F R R A R A R R R R R R R R R R R R R 211.1 R P R R R R R R R R R R R R R R F R A R A R R R A sp id o li tu s p . co n st ri ct u s (< 1 0 µ m ) H a q iu s ci rc u m ra d ia tu s H el ic o li th u s a m ce p s G a rt n era g o se g m en ta tu m N a n n o co n u s sp . A rk h a n g el sk ie ll a c ym b if o rm is C h ia st o zy g u s li tt era ri u s Pre d isc o sp h a era c o lu m n a ta T et ra p o d o rh a b d u s d ec o ru s Am p h izy g u s b ro o ksi i b ro o ksi i C yc la g el o sp h a era re in h a rd ti i C yl in d ra li th u s sc u lp tu s Re te ca p sa su ri re ll a H el ic o li th u s tra b ec u la tu s M ic u la sw a st ic a W a tzn a u eri a c o m m u n is W a tzn a u eri a m a n iv it ia e Z eu g rh a b d o tu s b ic re sc en ti cu s Z eu g rh a b d o tu s em b erg eri Ei ff el li th u s n u d u s Ei ff el li th u s tu rr ise if fe li i L it h a st ri n u s g ri ll ii L u ci a n o rh a b d u s m a le fo rm is Q u a d ru m g a rt n eri L u ci a n o rh a b d u s q u a d ri fi d u s M a n iv it el la p em m a to id ea M ic u la st a u ro p h o ra M ic ro rh a b d u lu s d ec o ra tu s Pl a co zy g u s sp . Re in h a rd ti te s sp . Re te ca p sa c re n u la ta Re te ca p sa f ic u la Ru ci n o li th u s te re b ro d en ta ri u s W a tzn a u eri a b a rn esi a e W a tzn a u eri a b ip o rt a Am p h izy g u s m in im u s C a lc u li te s o b sc u ru s C a lc u li te s o va li s C era to li to id es sp . C ri b ro sp h a ere ll a e h re n b erg ii C yl in d ra li th u s se rr a tu s Ei ff el li th u s ex im iu s Ei ff el li th u s g o rk a e M ic u la c u b if o rm is CC18 NC18 NC17* UC12 UC13 UC14a UC14b Events BOTTACCIONE S A N TO N IA N C A M P A N IA N Bi sc u tu m c o n st a n s Z eu g rh a b d o tu s p ra esi g m o id es C yc la g el o sp h a era m a rg ere li i C yl in d ra li th u s sp . Bi sc u tu m sp . T ra n o li th u s o ri o n a tu s Ark h a n g el sk ie ll a c o n fu sa C yl in d ra li th u s n u d u s L u ci a n o rh a b d u s ca ye u xi i CC17 Pre d isc o sp h a era sp . Re te ca p sa a n g u st if o ra ta Re te ca p sa sp . Re in h a rd ti te s a n th o p h o ru s Rh a g o d isc u s p le b ei u s Bra a ru d o sp h a era b ig el o w ii A sp id o li tu s p . co n st ri ct u s C h ia st o zy g u s b if a ri u s D isc o rh a b d u s ig n o tu s A sp id o li tu s p . ex p a n su s (< 1 0 µ m ) A sp id o li tu s p . p a rc u s G ra n ta rh a b d u s co ro n a d ve n ti s Ru ci n o li th u s h a yi Z eu g rh a b d o tu s el eg a n s L it h ra p h id it es ca rn io le n si s M a rt h a st eri te s fu rc a tu s Z eu g rh a b d o tu s d ip lo g ra m m u s A sp id o li tu s p . p a rc u s (< 1 0 µ m ) C re ta rh a b d u s co n ic u s Ep ro li th u s sp . C yl in d ra li th u s b ia rc u s Pre d isc o sp h a era c re ta ce a A sp id o li tu s p . ex p a n su s Ah m u el le re ll a re g u la ri s

Table 1 - Calcareous nannofossils stratigraphic

distribution in the Bottaccione section and the

inferred biozones. Nannofossil abundances were

given as follow: Total abundance: Abundant (A) =

21 -30 specimens in each field of view; Common

(C) = 11-20 specimens in each field of view; Few

(F)= 6-10 specimens in each field of view; Rare

(R) = 1-5 specimens in each field of view. Species

abundance: Abundant (A) = > 1 specimen in each

field of view; Common (C) = 1 specimen in 2-10

fields of view; Few (F) = 1specimen in 11-30

fields of view; Rare (R) = 1 specimen in > 31

fields of view. Preservation is coded as good (G) if

nannofossil specimens show little or no evidence

of dissolution and/or overgrowth and the primary

morphological characters are only slightly altered

allowing species identification; moderate (M) if

specimens

exhibit

some

etching

and/or

overgrowth, primary morphological characters are

somewhat

altered

allowing,

however,

identification at the species level; poor (P) if

specimens show severe etching and/or overgrowth,

primary morphological characters are obliterated,

hampering identification at the species and/or even

generic level.