Uluru. The rock is mainly arkose, I gather, and on the northern face, there is a lot of honeycomb weathering. This section looks like a sagittal MRI of a human cranium.

The rock is mainly arkose, I gather, and on the northern face, there is a lot of honeycomb weathering. This section looks like a sagittal MRI of a human cranium.

The gable of a two-storey house, Machu Picchu. See the next shot as well.

The gable of a two-storey house, Machu Picchu. See the next shot as well.

The area is Triassic sandstone, a bit over 200 million years old. Life is tough, and after rain, snails work over the rocks, chewing off the algal growth. Look for their tracks.

The area is Triassic sandstone, a bit over 200 million years old. Life is tough, and after rain, snails work over the rocks, chewing off the algal growth. Look for their tracks.

The high sandstone ridges where engravings are found are often struck by lightning. After rain, the rock is wet, the moisture turns to steam, and exfoliation happens. The coin is 32 mm across.

The high sandstone ridges where engravings are found are often struck by lightning. After rain, the rock is wet, the moisture turns to steam, and exfoliation happens. The coin is 32 mm across.

Kata Tjutas. Some impressive blocks of conglomerate came down at some point...

Some impressive blocks of conglomerate came down at some point.

Kata Tjutas, Valley of the Winds. Closer view of the conglomerate.

Kata Tjutas, Valley of the Winds. Closer view of the conglomerate.

Kata Tjutas, Valley of the Winds.

Kata Tjutas, Valley of the Winds.

Kata Tjutas, Valley of the Winds.

Kata Tjutas, Valley of the Winds.

We had to get much closer to see Uluru.

We had to get much closer to see Uluru.

We were amazed to see, from 120 km out, what we took to be Uluru. Even when we stopped at "Mount Conner Lookout", the penny didn't drop, because out there, the slightest hummock is a mountain. Anyhow, that was Mt Conner, alias Fooluru.

We were amazed to see, from 120 km out, what we took to be Uluru. Even when we stopped at "Mount Conner Lookout", the penny didn't drop, because out there, the slightest hummock is a mountain. Anyhow, that was Mt Conner, alias Fooluru.

A bare hill near Standley Chasm.

A bare hill near Standley Chasm.

Leaving Machu Picchu by train, along the Urubamba River. Inca terraces and scree slopes.

Leaving Machu Picchu by train, along the Urubamba River. Inca terraces and scree slopes.

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