JMW Natures Images' photostream  

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Camera Canon EOS 5D Mark II
Exposure 8
Aperture f/22.0
Canon 24-70 mm f2.8L
Focal Length 50 mm
ISO Speed 100
Exposure Bias 0 EV

This view gives one the feel to the landscape here in this park as you approach the sand dunes. The San Luis Valley precedes the dunes to the southwest. The mountains of Sangre De Cristro are located to the north and east of the dunes ( on the right side over the top of the dunes) acting much like a shield for the winds that generally blow from the southwest (left side of this image)

Basically in simple terms, the sand moves down the mountains by various factors,generally water flow as in rivers, creeks and snow melt. The sand dries out and is blown back towards the mountains, which blocks the winds and the sand drops out of the air and form sand dunes. That's about as simple as it gets.

The dunes are in a constant state of change laterally and vertically. Footprints that show today will most likely be gone tomorrow.

I have the complete panoramic of this in still and in video.

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Camera Canon EOS 5D Mark II
Exposure 0.02 sec (1/50)
Aperture f/8.0
Canon 24-70mm f2.8L
Focal Length 27 mm
ISO Speed 200
Exposure Bias 0 EV

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Somedays the lighting is just right to look for the oddities in nature. As soon as I saw this, the title became very clear. Rock Art...rocks.

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Camera Canon EOS 7D
Exposure 0.003 sec (1/400)
Aperture f/7.1
Canon 100-400mm IS L
Focal Length 150 mm
ISO Speed 200
Exposure Bias -2/3 EV

This is the wide view of a previous post of this waterfall. This was a fairly easy hike from the parking lot, but it had rained and the trail was a bit slippery on this day. This is actually a very pretty waterfall and worth your effort if your in the area.

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Camera Canon EOS 5D Mark II
Exposure 0.4
Aperture f/22.0
Canon 24-70mm f2.8L
Focal Length 35 mm
ISO Speed 100
Exposure Bias 0 EV
Polarising Filter

I'm not sure just what the bright yellow bushes are, but they certainly do spice up a FG. The sky shows the approaching storm front moving in that eventually dropped a bit of snow early one morning as I was making coffee on the tailgate of my truck.

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Camera Canon EOS 5D Mark II
Exposure 0.013 sec (1/80)
Aperture f/13.0
Canon 24-70mm f2.8 L
Focal Length 64 mm
ISO Speed 400
Exposure Bias 0 EV