#Archaeology31 - Day 5 #Door. The evidence for doors in the Roman world is really rich, if not always at the forefront of Roman urban studies. Over the years I've taken a special interest in the retail thresholds, like this one excavated by @UCPompeii at VIII.7.4.

This type almost always opened onto a shop. The groove allowed for for the shuttering at night, and the open end allowed for the swinging of the 'night door'. The plaster cast of the door at Pompeii (IX.7.10) fleshes it out a bit. #Archaeology31

These retail thresholds are an invention of the earliest years of the 1st c. CE. And they appear en masse, popping up all over the Roman world but made of local materials. The knowledge networks here are pretty powerful. These are at Baelo Claudia, Spain. #Archaeology31

And some more from Ostia (Italy) and Volubilis (Morocco). #Archaeology31

And a favourite is the threshold we recently excavated at Tharros (Sardinia) with @UCTharros. #Archaeology31