The party is steadily lowered, about 10 inches a second, down to the platform one hundred feet below. Naturally, I would expect the party to keep their lights flashing in every direction, looking to ensure their safety. You see nothing, as you come down safely. The cage settles on a round circle of paved blocks, much like was described in the descending chamber above.
I'll forego making a map of the room you're in; it is very like the descending chamber, a circle with a single tunnel leading from it. This tunnel, however, is not rough-hewn. The walls and ceiling, like the floor, are made of paved blocks. It is about 7 feet high and nearly six feet wide, with no door.
At the door of the tunnel are four carved stones, resting on pedestals of moderately different heights ~ 34, 38, 43 and 46 inches tall. The stones are, as I said, oval figurines; each is of an animal, but as the carving is not deep into the stone, the animals are more representations than realistic carvings. The first, on the highest pedestal, has the body of a bear but a head that might be a stag or a ram. A second is of a large, upright, two-legged beast with a dog's head. The third is a multi-coiled snake that might, looked at the right way, have a dragon's head. The last, on the lowest pedestal, is clearly a frog.
Engelhart's beast forms enables him to identify the first: it appears to be something related to an owlbear, but it is long extinct. The two-legged beast is a humanoid and outside his ken. He feels sure that it is a dragon, and guessing from the shape of the "head" it seems to be from a benevolent form. Finally, the frog is undoubtedly more than just a frog: he is sure it is an ice toad.
The stones are all at least a thousand years old and each weighs about 80 lbs. Though the carving is not of the highest order, it is probable their uniqueness would make them each valuable.