Showing posts with label geology. Show all posts
Showing posts with label geology. Show all posts

Friday, April 29, 2016

Exceeding expectations on the NW coat of Jura.

We had a big day ahead of us so we rose before dawn at Glengarrisdale in NW Jura. The dawn light spread through the Gulf of Corryvreckan which separates Jura from the dark brooding cliffs of its northern neighbour, Scarba.

 After cleaning up the bothy fire and having our breakfast we had carried our things to the shore and...

 ...were on the water by eight am. The tide was rapidly emptying the bay so there was a bit of catch up involved as we carried each loaded bout to the water's edge.

 It was great to be floating and weightless again after the heavy work on land. It was a perfect day with a blue sky, light breeze and a dropping swell.

 We waved goodbye to our new friends, Tom and Frances, who were watching the sunrise from the rocks at the entrance to the bay.

 On a last look through the Corryvreckan, we spotted the still snow streaked...

 ...summit of Ben Cruachan some 54km away to the NE.

 Ahead the NW coast of Jura stretched away in a series of bold headlands to distant Islay on the horizon. The series of cliffs, headlands and deep rocky bays gives no landing for 10km until they are breached at Corpach Bay.

 Above our heads we spotted the first of many mimetoliths on Jura..Iguana Rock.

The island of Jura has always been one of the least populated in the Hebrides. This is due to it being formed mostly of metamorphic quartzite interspersed with igneous basalt dykes. It produces a thin acidic soil, which is not conducive to agriculture.

 As we travelled SW we left the stronger tides of the Corryvreckan area behind and it was a pleasure to...

 ...take our time enjoying the views of the bold headlands...

 ...in the early morning light.

 Sometimes we entered the deep shade below the cliffs and were surprised to see...

 ...goats scrambling along ledges above precipitous drops.

To our right, the low outline of Colonsay beckoned. It was within reach being just 15km away. We would have had time to explore Oronsay then catch the 18:15 ferry down to Port Askaig in the Sound of Islay. Both Ian and Mike had expressed an interest in visiting Colonsay during pre-trip planning. But as I expected, they had both already been captivated by Jura and had decided to spend time exploring this wonderful coastline instead.

We soon came to the first raised beach of quartzite cobbles. Ian and Mike started snapping away with their cameras but I told them they would see plenty more!

 We passed a wreck of a dinghy which had been tossed high above the beach by winter storms.

 We were so glad to be here in such benign conditions, just two days previously the ferries had been storm bound!

The coast is riddled with caves. This now dry sea cave has a waterfall running down its back, The burn enters it through an ancient blow hole in its roof.

We had an exciting moment when a white tailed sea eagle rose from a skerry just a few metres beyond us then perched on the clifftop after just a few lazy beats of its wings.

Low tide reveals many offshore skerries with long passages running parallel to the shore. Some were blind and we had to retrace our wakes but fortunately this one lead through a tight gap to open water beyond. My goodness we needed a break to take it all in!

Thursday, November 26, 2015

A rocky epilogue in Corbies Cove.

From Corbies' Cove it was a short paddle to the contorted rocks of Ravenshall Point.

 It was near HW and we were able to make our way through several rocky channels to...

 ...the NW side of the point where this rather fine arch is situated.

 At this point we turned back towards...

 ...Corbies' Cove where the sand below the waterfall was now well under water.

As we paddled east we dallied at almost every corner...

 ...it was so warm that many Red Admiral butterflies were warming themselves on the rocks just inches from the sea.

 We really did not make rapid progress as we looked for any excuse to divert into...

 ...every nook and cranny.

We came across this rather fine cave that stretched in as far as the eye could see.  I am pretty sure this would have been used by the many smugglers that used to frequent this coast.

This section of coast at high tide is a real treat, the gaps between the rocks become ever smaller!

Along this coast most of the rock is Silurian greywacke sandstone but there are a few volcanic dolerite intrusions, like this one, complete with gas bubbles. Our trip to the Solway was nearly over as just round the corner we would pass a series of caravan sites but what a wonderful rocky epilogue Corbies Cove had proved to be.

Tuesday, November 24, 2015

A room with a view on Murray's Isles and anomalous petrol pumps.

 As we prepared to leave Barlocco beach the sky clouded over and there was a chill wind from the north. We decided to set off in our dry suits.

Having failed to circumnavigate Barlocco Isle the previous evening we set off to do so now. We literally floated over the route of our tough portage!

 The reefs of Barlocco Isle are a great place to explore as long as there is no swell.

 The sharp fangs of rock could easily puncture a kayak. From the channels of Barlocco we set off for...

 ...wooded Ardwall Isle with its former farm house hiding on the seaward side. The isle was once home to a well known smuggling family.

 From Ardwall Isle we set off across the channel to the Murray's Isles.

The flood spring tide was running and we had to set a surprisingly high ferry angle to maintain the transit of the white farm house above the gap in the reef.

The Murrays Isles are named after Mr James Murray of Cally. He was one of the drivers of the development of Gatehouse of Fleet in the 18th century. A descendant of his, Mrs Elizabeth Murray Usher bequeathed the isles to the National Trust of Scotland following her death in 1990. Mrs Murray Usher was the main landowner in the area and she had rather fixed ideas of how Gatehouse of Fleet should look. In the mid 20th century there were two petrol stations in Gatehouse, one at either end of the town. The Esso station with its red and white livery was the first. To get planning permission from Mrs Murray Usher for the second, Shell petrol station, it also had to paint its pumps red and white as well so that it did not clash. It was the only Shell petrol station in Britain that did not have yellow and white pumps!

We landed in a little cove on the SW side of the larger island and made our way up over very tussocky ground to the...

 ...lichen covered ruins of a cottage. The house has an interesting history. It was built at the same time that the canal was cut from the head of the Fleet estuary to the town of Gatehouse and Port Macadam was built.  The house was for the pilot who escorted ships up the Fleet.

It was customary in exposed locations, it was built with its gable facing the prevailing wind and the open sea. Unusually it had a window in the gable so that the pilot could keep a lookout for ships. The house was also used as an inn for sailors from ships waiting for the tide. The pilot was also the guardian of the Fleet Bay oyster beds. He also had a part time job as customs officer as smuggling was rife on this coast.

I do not normally land here in spring and early summer as the island is a breeding site used by herring gulls, lesser black backed gulls and cormorants.

It is the biggest cormorant colony in the Solway Firth. Once the birds have gone the...

 ...grasses and flowers grow profusely being well fertilised by the bird's guano.

We made our way back to the beach where we discovered a split piece of Silurian sandstone that appeared to have a fossil in it.

The little cove was sheltered from the wind so we settled down to a well deserved second breakfast.