Upturned marble step block at I/19,20-3/9. It originally lay on the poros block immediately to the North; three courses of the foundations of the monument to which the marble step block belonged are visible; ... AMS northeast 1182 Horizontal (normal) ... 29 Jun 1990 ... Upturned marble step block at I/19,20-3/9. It originally lay on the poros block immediately to the North; three courses of the foundations of the monument to which the marble step block belonged are visible; from southwest.