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NITMILUK NATIONAL PARK #8

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Another view when the Katherine Gorge becomes narrow with its high and steep walls cutting in the sandstone plateau. There are several right angle bends where the river has followed lines of weaker rock.

“Nearly two billion years ago the present-day area of Nitmiluk was covered by shallow seas and braided stream depositing masses of sediment on underlying base rock. Subsequently the sediment was compressed to form sandstone and conglomerate layers up to 2000 metres thick in a formation called the Kombolgie Subgroup; these layers can still be seen in the gorge walls today. After the sandstone and conglomerate had formed and while it was still deep underground, tectonic movement in the base rock caused cracks and faults in the sandtone. Many faults and fractures were at right angles to each other; some were filled with dolerite from hot volcanic magma - these dolerite dikes were up to ten metres wide and several kilometres long running through the sandstone.

Eventually the mass of sandstone and conglomerate was exposed and subjected to normal weathering. The hard sandstone resisted stream erosion but dolerite dikes and fractured rock in the fault zones were more easily eroded; dolerite is particularly prone to chemical weathering in the tropics. The early Katherine River therefore followed a zig zag course along the lines of faults and dikes. Eventually the river eroded the deep gorges we see today along that erratic course. Long and narrow secondary gorges formed running away from the river where dolerite weathered away leaving fertile, dark soil in the shelter of high, steep walls retaining remnant forest habitats.”

Contrasting with the gorges, the top of the sandstone plateau remains an especially harsh environment of sandstone broken by deep chasms and gullies. During the Wet Season, water remains trapped for months in warm pools and swamps; in the Dry Season the area is extremely arid with surface temperatures up to 60 degrees C.
(https://www.nitmiluktours.com.au/the-jawoyn/)

Brand:NIKON CORPORATION
Camera:Nikon D90 Check out Nikon Nation!
Lens:AF-S DX VR Zoom-Nikkor 16-85mm f/3.5-5.6G ED Check out Nikon Nation!
Recording media:JPEG (digital)
Date Taken:14 Jun 2012 - 11:37 AM
Focal Length:22mm
Lens Max Aperture:f/3.9
Aperture:f/16.0
Shutter Speed:1/80sec
Exposure Comp:-1/3
ISO:200
Exposure Mode:Manual
Metering Mode:Multi-segment
Flash:No Flash
White Balance:Auto
Title:NITMILUK NATIONAL PARK #8
Username:JN_CHATELAIN_PHOTOGRAPHY JN_CHATELAIN_PHOTOGRAPHY
Uploaded:25 Jan 2013 - 5:13 PM
Tags:Katherine, KATHERINE RIVER, Landscape / travel, NITMILUK NATIONAL PARK, Northern territory
Votes:30

Comments

CarolG
CarolG e2 Member 7128 forum postsCarolG vcard Greece17 Constructive Critique Points
25 Jan 2013 - 5:25 PM

Wonderful reflections, Jean-Noel, a beautiful composition and capture. Carol

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NDODS
NDODS e2 Member 43242 forum postsNDODS vcard United Kingdom103 Constructive Critique Points
25 Jan 2013 - 5:48 PM

You clearly know your rocks from your socks Jean-Noel, whilst at the same time having a great eye for a great image.

Regards Nathan

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jaktis
jaktis e2 Member 1081 forum postsjaktis vcard Sweden
25 Jan 2013 - 6:59 PM

A good POV for the beautiful sight

Peter

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tomcat
tomcat e2 Member 95916 forum poststomcat vcard United Kingdom15 Constructive Critique Points
25 Jan 2013 - 7:36 PM

Another extremely interesting image, followed by a fine narrativeSmile

Adrian

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EMJAYCEE
EMJAYCEE e2 Member 5EMJAYCEE vcard England10 Constructive Critique Points
25 Jan 2013 - 8:43 PM

The reflections are qute beautiful and the experience must have been awesome.
Joan.

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Daisymaye
Daisymaye e2 Member 5Daisymaye vcard Canada9 Constructive Critique Points
25 Jan 2013 - 10:32 PM

A lovely low pov. Well captured........Sandy

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Joline
Joline e2 Member 8Joline vcard United States51 Constructive Critique Points
26 Jan 2013 - 12:22 PM

What gorgeous reflections in that clear water.

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NeilWigan
NeilWigan e2 Member 4NeilWigan vcard England15 Constructive Critique Points
26 Jan 2013 - 4:26 PM

some great light detail and textures in the set ,the bigger boat made sense.Smile

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