Calcari ad aptici e Saccocoma Formation
The Calcari ad aptici e Saccocoma Formation,[1] also known as the Saccocoma Formation (known in English as the Haptic limestones and Saccocoma Formation), is a geologic formation in Camponocecchio, Italy that dates back to the Tithonian (152 Ma) - it was first identified in 1976/1980,[2][3] and was named in 2002.[1] It was probably a marine shale due to the fossil content.[4] Fossils found there include ammonites, cnidarians and the ichthyosaur Gengasaurus, discovered in 1976.[5] Many of the fossils found in this formation are housed at the Spaelaeo-Palaeontologic Museum in Genga.
| Calcari ad aptici e Saccocoma Formation | |
|---|---|
| Stratigraphic range: Tithonian, | |
| Type | Group |
| Unit of | 'Calcari Diasprigni' |
| Thickness | Up to 30 metres (98 ft) |
| Lithology | |
| Primary | Limestone and sandstone |
| Other | Chert |
| Location | |
| Region | Marche |
| Country |  Italy |
| Extent | Camponocecchio and Genga |
| Type section | |
| Named by | Fabio Galluzzo & Massimo Santantonio (2002)[1] |
| Location | Camponocecchio |
| Year defined | 1976/1980[2] |
Paleofauna
Indeterminate ammonites and cnidarians are known from the formation.[5]
- Gengasaurus nicosiai[5]
- Kobya monteneronensis[6]
References
- Galluzzo, F. & Santantonio, M. (2002). The Sabina Plateau: a new element in the Mesozoic palaeogeography of Central Apennines. Bollettino della Società Geologica Italiana S1, 561–88.
- Fastelli, C. & Nicosia, U. (1980). L'Ittiosauro di Genga (Ancona). In I vertebrati fossili italiani (eds Parisi, G. & Seppi, G.), pp. 95–101. Verona: Catalogo della Mostra.
- De Marinis, G. & Nicosia, U. (2000). L'Ittiosauro di Genga. Castelferretti, Ancona: Cassa di Risparmio di Fabriano e Cupramontana Edizioni, 220 pp.
- "Paleo Profile: The Genga Lizard". Scientific American. Retrieved 9 October 2020.
- Ilaria Paparella; Erin E. Maxwell; Angelo Cipriani; Scilla Roncacè; Michael W. Caldwell (2017). "The first ophthalmosaurid ichthyosaur from the Upper Jurassic of the Umbrian–Marchean Apennines (Marche, Central Italy)". Geological Magazine. 154 (4): 837–858. Bibcode:2017GeoM..154..837P. doi:10.1017/S0016756816000455. S2CID 132955874.
- G. A. Gill, M. Santantonio, and B. Lathuiliere. (2004). The depth of pelagic deposits in the Tethyan Jurassic and the use of corals: an example from the Apennines. Sedimentary Geology 166:311-334
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