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Rock formation, Ishigaki,okinawa,Japan by Brian Yamamoto

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About This Gigapan

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Taken by
Brian Yamamoto Brian Yamamoto
Explore score
87
Size
0.20 Gigapixels
Views
2873
Date added
Nov 22, 2009
Date taken
Nov 07, 2009
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Description

I am looking for assistance from Geologist and earth scientists on the
identification of this type of rock formation on Ishigaki island.
This rock formation is on the southern end of Ishigaki island.It is ocean side of
Toujin Baka(chinese Grave site monument) There is also a small park and Lighthouse
at the point. This area of ishigaki is across from the Taketomi Island port.
The rock formation extends into the ocean but is bordered on both sides by
extensive coral and sand beach. This gigapan is a portion of the rock formation
that was exposed well and not in water. The unusual wave like rocks caught
our attention.Small chunks of rock that are blue green,reddish and orange are scattered
around the formation and in the ocean.This area has Ryukyu limestone formations but
this does not look like limestone.


Gigapan Comments (1)

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  1. Keith patton

    Keith patton (November 30, 2009, 04:56AM )

    Brian: It is indeed limestone (test it with dilute acid if you can it will effervess or fizz as the acid dissolves the calcium carbonate in the limestone. The rock appears to be made up of interbedded limestone and silt stone with possible sandy layers. It has undergone compressional deformation resulting in the folds and fractures. It is difficult to tell if the deformation was great enough to be classified as metamorphism resulting in changes to the fabric of the rock other than the folding. The marked shaley fabric of the rock is also a result of the compressonal stress causing some realignment of the grains in the rock layers. Notice the small fractrues in the rock that exhibit 120 and 60 degree spacing. This is indicative of compressional stress due to tectonic movement along the plate boundary on which the Ryukyus lie. I would guess that this rock is apart of the Naha Limestone Formation or possibly the more highy deformed Shimajiri formation which also is found on the southern part of Okinawa. The formation if not identical is probably related by mode of formation and deposition. It is 7-20 meter thick and is coarse to medium lime sand and powdery non-porous limestone. The rock forms structures with one gentle slope and one steep face which forms an escarpment, typical of structures like the Maeda Escarpment of southern Okinawa sciencelinks.jp/j-east/article/200 004/000020000400A0051415.php Will open in
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Stitcher Notes

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GigaPan Stitcher version 0.4.3864 (Windows)
Panorama size: 199 megapixels (13897 x 14370 pixels)
Input images: 54 (6 columns by 9 rows)
Field of view: 24.4 degrees wide by 25.2 degrees high (top=14.5, bottom=-10.8)
Settings:
All default settings
Original image properties:
Camera make: Canon
Camera model: Canon PowerShot SX110 IS
Image size: 3456x2592 (9.0 megapixels)
Capture time: 2009-11-07 22:45:53 - 2009-11-07 22:51:21
Aperture: f/7.1
Exposure time: 0.0166667
ISO: 80
Focal length (35mm equiv.): 357.6 mm
Digital zoom: off
White balance: Fixed
Exposure mode: Manual
Horizontal overlap: 39.2 to 41.9 percent
Vertical overlap: 42.4 to 43.6 percent
Computer stats: 2038.11 MB RAM, 2 CPUs
Total time 50:40 (0:56 per picture)
Alignment: 21:20, Projection: 3:43, Blending: 25:35

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