From another recent thread...
First tile is always placed in the center, unless it is one of the timer tiles.
Second tile is always placed in the appropriate quarry, unless it is one of the timer tiles.
There are no replacements should a timer tile be drawn in either spot.
If the first tile is a timer tile, and the center is otherwise empty, can you still choose to "buy" tiles, effectively doing nothing?
(The rules explicitly permit a "null" auction, but say nothing about a "null" purchase.)