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Introduzione INDICE GENERALE INTRODUZIONE .................................................................................................................. 5 1. STUDI PALEONTOLOGICI SUL GIURASSICO MEDIO E SUPERIORE IN SICILIA OCCIDENTALE ................................................................................................................... 7 2. PALEOECOLOGIA E PALEOBIOLOGIA DELLE AMMONITI ............................................ 13 3. EVOLUZIONE E PALEOGEOGRAFIA DELLE AMMONITI GIURASSICHE.......................... 19 3.1 PREMESSA ......................................................................................................... 19 3.2 AMMONITI GIURASSICHE E LORO EVOLUZIONE ................................................. 20 4. DISTRIBUZIONE STRATIGRAFICA E DIFFUSIONE PALEOBIOGEOGRAFICA DEI PRINCIPALI TAXA DI AMMONITI DELLA TETIDE OCCIDENTALE DURANTE IL GIURASSICO MEDIO E SUPERIORE ...................................................................................................................... 27 4.1 IL LIMITE CALLOVIANO-OXFORDIANO .............................................................. 37 4.2 IL PIANO OXFORDIANO. SCHEMI BIOSTRATIGRAFICI ADOTTATI ........................ 40 4.2.1 DISCUSSIONE .................................................................................................... 41 4.3 IL LIMITE OXFORDIANO-KIMMERIDGIANO ........................................................ 43 4.4 IL KIMMERIDGIANO .......................................................................................... 50 4.5 SCHEMA BIOZONALE AD AMMONITI ADOTTATO PER LA PROVINCIA MEDITERRANEA ........................................................................................................... 51 4.5.1 KIMMERIDGIANO INFERIORE ............................................................................................. 53 4.5.2 KIMMERIDGIANO SUPERIORE ............................................................................................ 55 5. MATERIALI E METODI ....................................................................................... 57 5.1 STRATIGRAFIA .................................................................................................................. 57 5.2 COLLABORAZIONI INTERNAZIONALI ................................................................................. 58 5.3 CRITERI SEGUITI PER LO STUDIO TASSONOMICO ................................................................ 58 5.4 CRITERI SEGUITI PER LO STUDIO TAFONOMICO.................................................................. 62 5.5 REVISIONE DELLE COLLEZIONI STORICHE ......................................................................... 70 6. STRATIGRAFIA ......................................................................................................... 71 6.1 INQUADRAMENTO GEOLOGICO DELLE SUCCESSIONI GIURASSICHE DELLA SICILIA OCCIDENTALE ............................................................................................................. 72 6.2 IL DOMINIO SACCENSE ..................................................................................... 81 6.3 CAVA EX-CAPRARIA ......................................................................................... 86 6.4.1 DESCRIZIONE DELLA SEZIONE ........................................................................................... 88 6.4.2 ASSOCIAZIONI AD AMMONITI ........................................................................................... 94 6.4.3 OSSERVAZIONI TAFONOMICHE.......................................................................................... 96 6.4.4 BIOSTRATIGRAFIA ............................................................................................................. 97 6.5 STRETTA ARANCIO......................................................................................... 102 10.1 DESCRIZIONE DELLA SEZIONE ......................................................................................... 103 10.2 ASSOCIAZIONI AD AMMONITI ......................................................................................... 114 10.3 OSSERVAZIONI TAFONOMICHE........................................................................................ 115 10.4 BIOSTRATIGRAFIA ........................................................................................................... 116 6.6 VALLONE SAN VINCENZO ............................................................................... 119 6.6.1 DESCRIZIONE DELLA SEZIONE ......................................................................................... 119 6.6.2 GENESI DEI COQUINA LIMESTONE ................................................................................... 124 6.6.3 ASSOCIAZIONI AD AMMONITI .......................................................................................... 125 6.6.4 OSSERVAZIONI TAFONOMICHE........................................................................................ 125 6.6.5 BIOSTRATIGRAFIA DELL‘OXFORDIANO DI VALLONE S. VINCENZO ................................. 126 6.7 CONTRADA DIESI ............................................................................................ 129 6.8 CONTRADA MONZEALESE ............................................................................... 133 7. CORRELAZIONE FRA LE SEZIONI STUDIATE E SINTESI STRATIGRAFICO-STRUTTURALE PER L‘INTERVALLO CALLOVIANO-TITONIANO NEL DOMINIO SACCENSE ........................ 136 8. CONFRONTI TRA LE SUCCESSIONI MEDITERRANEE E QUELLE SUBMEDITERRANEE (CORDILLERA IBERICA) DURANTE IL GIURASSICO SUPERIORE ................................... 140 8.1 STRATIGRAFIA E LITOFACIES........................................................................................... 143 8.2 CONFRONTI CON LE SUCCESSIONI DELLA PROVINCIA MEDITERRANEA DURANTE IL GIURASSICO SUPERIORE ................................................................................................................... 147 9. CONCLUSIONI ........................................................................................................ 149 10. REVISIONE SISTEMATICA DELLE COLLEZIONI STORICHE ........................................ 151 10.1 LE COLLEZIONI PALEONTOLOGICHE DI STRETTA ARANCIO ............................................. 152 10.2 LA COLLEZIONE MARIANO GEMMELLARO (COLLEZIONE 017) ....................................... 154 10.3 LA COLLEZIONE BRUNO ................................................................................................. 155 10.4 CONSIDERAZIONI FINALI ................................................................................................. 157 10.5 ELENCO DEI TAXA REVISIONATI ..................................................................... 162 Phylloceras (Phylloceras) isomorphum Gemmellaro, 1873 ........................................................... 168 Phylloceras (Phylloceras) kudernatschi (Hauer, 1854) .................................................................. 169 Phylloceras (Phylloceras) isotypum Benecke, 1865 ....................................................................... 170 Phylloceras sp. ................................................................................................................................ 172 Holcophylloceras zignodianum (d‘Orbigny, 1848) ........................................................................ 173 Calliphylloceras disputabile (Zittel, 1869) ..................................................................................... 175 Calliphylloceras cf. disputabile (Zittel, 1869) ................................................................................ 178 Calliphylloceras empedoclis (Gemmellaro, 1872).......................................................................... 180 Ptychophylloceras sp. ..................................................................................................................... 181 Ptychophylloceras euphyllum (Neumayr, 1870) ............................................................................. 182 Ptychophylloceras flabellatum (Neumayr, 1871) ........................................................................... 183 Ptychophylloceras ptychoicum (Neumayr, 1871) ........................................................................... 185 Sowerbyceras silenum (Fontannes in Dumortier & Fontannes, 1876) ............................................ 186 Sowerbyceras sp. ............................................................................................................................ 188 Lytoceras eudesianum (d‘Orbigny, 1846) ....................................................................................... 189 2 Lytoceras polycyclum Neumayr, 1871 ............................................................................................ 191 Lytoceras cf. orsinii Gemmellaro, 1872 ......................................................................................... 192 Lytoceras polyanchomenum Gemmellaro, 1873 ............................................................................. 193 Protetragonites quadrisulcatus (d‘Orbigny, 1840) ......................................................................... 195 Haploceras (Haploceras) carachtheis (Zeuschner, 1846) .............................................................. 197 Haploceras sp. ................................................................................................................................ 198 Neolissoceras grasianum (d‘Orbigny, 1841) .................................................................................
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