Erycites Fossil at Sapienza Università di Roma

Here is a picture of a fossil housed in a display case at the Geologia building located on the campus of Sapienza University of Rome. The case can be found on the second floor of the building. The ammonite fossil is called Erycites sp. and lived in the Lower to Middle Jurassic Period. The specimen was found in the Toarcian stage of the Umbro-Marchigiano-Sabina facies of central Italy near the village of Polino.

The university was founded in 1303 by Pope Boniface VIII. In 1870, it became a public university for the state of Italy.

Sources:
http://www.uniroma1.it/ateneo/chi-siamo/la-storia

http://tetide.geo.uniroma1.it/dst/grafica_nuova/pubblicazioni_DST/geologica_romana/Volumi/Vol%2016/GR_16_263_283_Nicosia%20et%20al.pdf

Pseudofossils at Pompeii Italy

When visiting the ruins of the ancient Roman city of Pompeii, study the details of some of the rocks that make up the walls. Some appear to be clusters of tube like shapes that resemble fossils. There are quite a few of these rocks to see in the numerous walls throughout the ruins.

What I would like to know is how did they form?

Are they a byproduct of the eruption of Mount Vesuvius?

UPDATE: I think these specimens are travertine (limestone concretions with remains of plant stems). They are not from the volcano. It would be nice to know where they originated though.

Example of walls found in the ruins at Pompeii.

What is left of some Roman columns at Pompeii.

Fossils at San Gimignano Italy

My visit to Italy was mostly a vacation just to relax so I did not do much research to find museums or fossil/mineral sites to visit. I read that it is illegal to collect fossils in Italy and their museums have some odd schedules about being open. That said, I did keep my eyes open to geological features at places we stopped to visit. One town we spent a few hours at was San Gimignano, Italy.

One of the walls had a stone block that had some fossils in it. The fossil I could see was a small gastropod calcite fossil about 2 cm in diameter. The rest of the brown block had broken shell fragment fossils.

A nearby stone in the same wall had an interesting pattern on it. Could it be volcanic in origin?

Near the wall were olive trees, here is picture of some baby olives.

Here is a panoramic view from San Gimignano of the surrounding countryside:

I found a small shop that sold jeweler and some mineral and fossil specimens. It is called Mirone Alabastri (53037 San Gimignano, Firenze). The fossils they sold were ammonites found in Madagascar. I did find some mineral specimens from Italy there that seemed unique.

Here is a dark quartz crystal in matrix from the quarries at Monterigginoi near Siena. Learn more about the locality here: http://www.mindat.org/loc-125546.html

This green mineral might be malachite. The specimen was found at Serrabottini Massa Marittima in Grosseto Province of Tuscany Italy. Learn more about this locality here: http://www.mindat.org/loc-64651.html

These next set of images are of the specimen magnified under the microscope x23. Learn more about this locality's malachite here: http://www.mindat.org/gallery.php?cform_is_valid=1&loc=64651&min=2550&cf_pager_page=2

The last mineral picture is a piece of galena from unknown locality.