Travertine

Abbey of Sant'Antimo, nave. Montalcino, Italy.
The stone used here is local blocks of traveretine stone which has a similar appearance to alabaster.

Travertine

A limestone formed by the precipitation of the calcium carbonate in spring water upon exposure to air. It has been found in large quantities in the Tiber valley near Rome and elsewhere in Italy. It varies in color from pale buff to orange pink and has been frequently used for the buildings of Rome, notably the Colosseum and the colonnade of St Peter's. Recently it has been exported in great quantities from Italy on account of its popularity as an external cladding material in some forms of modern architecture. (Michael Clarke)

Jamb

The Jamb is directly around the wood door... apologies for the poor quality photograph!

Workshop of Pietro of Alberico, fragment of jamb with Telamon. Bologna, Cathedral of San Pietro. 12th century.

Workshop of Pitro of Alberico, fragment of jamb with vine motif filled with fantastic animals. Bologna, Cathedral of San Pietro. 12th century.

The side of an archway, door-opening, or window that, properly speaking, is load-bearing; generally used to describe the vertical linings of such architectural openings. (Michael Clarke)