GeologyRocks

• Location: Antigua, Caribbean
• Date Taken (dd-mm-yy): 14/01/2008

This is Hell's Gate on the North-East side of Antigua. This is a natural arch formed by weathering and erosion of Oligocene limestone. The sea at the front is the Caribbean. On the other side of the arch is the Atlantic ocean. The arch itself is well weathered, showing great (and very sharp!) karstification. It is possible to climb up the left side (through a cave), walk over the arch and back down on the right-hand side.

• Location: Quarry near Coco Bay Hotel, Antigua, Caribbean
• Date Taken (dd-mm-yy): 17/01/2008

I think this is an altered limestone reef (Oligocene) that formed at the same time that the main volcano of Antigua was forming. As the volcano became less active, small reefs - only 10s of metres in size would form along the sides. As the volcano was active, the relative sea level would rise and fall rapidly, causing drowning or emergence of the reefs. However, later eruptions would occur, covering the reefs and altering them. This may be one such reef (the lighter grey area, whereas the red/brown rock is basalt).

• Location: White Scar Caves, North Yorkshire.
• Date Taken (dd-mm-yy): 09/08/07

A structure called "The Devil's Tongue", we were told that the artificial lighting accounted for any green algal growth. However, I'm uncertain as to the source of the blue/purple hue. Whether it occurs as a result of camera flash or a mineral other than calcium carbonate being deposited I don't know.

• Location: White Scar Caves, North Yorkshire.
• Date Taken (dd-mm-yy): 09/08/07

As in Flowstone Formation 1.

• Location: White Scar Caves, North Yorkshire.
• Date Taken (dd-mm-yy): 09/08/07

As in Flowstone Formation 1.

• Location: White Scar Caves, North Yorkshire.
• Date Taken (dd-mm-yy): 09/08/07

This is the first of a set of three related photos showing interesting flowstone (calcium carbonate - precipitated out of solution) deposits. I'm sorry for the lack of anything approaching a scale in these pics by the way, I'm too slow-witted...

• Location: White Scar Caves, North Yorkshire
• Date Taken (dd-mm-yy): 09/08/07

Having returned from this year's holiday I thought I'd share a few of my snaps. Unfortunately I don't know much about the geology of the area I visited (which fortunately didn't stop me from enjoying it!). However if anybody wishes to know a little more about the area, I found this: http://www.fortunecity.com/greenfield/ecolodge/25/unfolding.htm to be helpful. Not too in depth so feel free to search for more if interested...

• Location: Ingleborough North Yorkshire
• Date Taken (dd-mm-yy): 09/08/07

At 2,373 ft Ingleborough is the second highest of North Yorkshires "Three Peaks". Its distinctive plateau is the result of a layer of relatively resistant Milstone Grit overlying Carboniferous Limestone.