Tag Archives: geology

Malham Cove to Flasby

A most glorious summer day, a second glorious summer day in the Dales and we did the famous walk to Malham Cove, carved out by water and ice. My pictures make it look empty, but it was full of people. We did, of course, have lovely moments of emptiness, but it was so busy we didn’t walk in the file of people going to the bottom of the cove. We didn’t do more than pause a moment at Janet’s Foss, but it was lovely to see the families enjoying the water.

We also had ice cream. Glorious.

But best of all were the limestone pavements up above Malham Cove, I had never really seen such pavements before. Not like this.

An image of the limestone pavement at Malham Cove

It wasn’t until later that I read more about how these formed–the geology of it is quite amazing.

Karst is defined as a landscape whose features develop are dependent on the presence of efficient underground drainage. Except in deserts, this is only completely achieved where there are caves large enough to carry streams and rivers, and cave passages are only formed naturally in soluble rocks where the groundwater can dissolve away the walls of narrow fissures to turn them into large caves. So karst is a feature of soluble rocks, of which limestone is by far the most important (but is not the only one). Named after the Kras of Slovenia, karst terrains are found all over the world, and the Yorkshire Dales has one of the finest. (102)

Karst is defined as a landscape whose features develop are dependent on the presence of efficient underground drainage. Except in deserts, this valleys is only completely achieved where there are caves large enough to carry streams and rivers, and cave passages are only formed naturally in soluble rocks where the groundwater can dissolve away the walls of narrow fissures to turn them into large caves. So karst is a feature of soluble rocks, of which limestone is by far the most important (but is not the only one). Named after the Kras of Slovenia, karst terrains are found all over the world, and the Yorkshire Dales has one of the finest.

… most Dales karren are much more rounded, in a style that makes them known as rundkarren. The rounding is normally developed when they form underneath a soil cover, where the soil and vegetation keep percolation water against all the limestone surfaces. In few places, notably at the top of Malham Cove it can be seen that soil has recently been stripped off the pavement along the back margin, so that these rundkarren appear to be true sub-soil features. (104)

This is difficult language to piece together, but I love how unfamiliar words like karst and karren fit this landscape. I love how it opens the earth up to understand the coming together of sea and sand, water and stone over the millions of years since the sporadic violence of tectonic movements first cast these ancient seabeds into the sky.

Waltham, Tony (2007) The Yorkshire Dales: Landscape and Geology. Ramsbury: Crowood Press.

Continue reading Malham Cove to Flasby

Last Desert Wander: Peppersauce Wash

Original idea? To maybe try Peppersauce cave, but then, you know, no headlamps, no extra clothes, slight fear of dark enclosed spaces and being lost forever even though the internet swears that is impossible. Follow-up idea? To hike up past it into Nugget Canyon, but then, you know, turns out I really hate driving very narrow winding mountain roads with drop-offs to one side when all the other vehicles coming the opposite direction are large trucks, some pulling improbable RVs. So we stopped at the campground and hiked up the wash/road that led up towards the foothills, and that was a rather short walk, but a nice one. despite having to stand aside to let a progression of ATVs and these new four-wheel souped up golf-cart things past us.

It was beautiful, full of oak trees and sycamores, a stretch with gurgling water falling over the stones.

Peppersauce Wash

Peppersauce Wash

Peppersauce Wash

As we climbed up out of the wash up a steep road, the view spread out behind us:

Peppersauce Wash

Peppersauce Wash

Before us:

Peppersauce Wash

The mountainside to our right was covered with tailings spilling down from mine workings

Peppersauce Wash

Small wonder that the road and the wash were full of the most amazing rocks — huge boulders of conglomerates that I haven’t seen before:

Peppersauce Wash

Amazing details:

Peppersauce Wash

Peppersauce Wash

Look at the geological history to be read here…

Peppersauce Wash

Lava flows, faultlines, clean breaks between past and present:

Peppersauce Wash

Some processed ores, and some local shooting:

Peppersauce Wash

Finally we saw three more deer, silently climbing high up the hill just as we reached the car again.

A last view of Oracle too, the antique store in town, still with some holiday cheer very reminiscent of that found in Tucson

Oracle Antiques

But also so much more…

Oracle Antiques

Oracle Antiques

Oracle Antiques

I am a bit sad to be back in Manchester, where the cold and damp are brutal and the sun apparently never shines…

Where LA’s stolen water comes from, the wonder of Owens Valley

The Coso Mountain range to the east of Owens Valley is a line of volcanoes that erupted again and again, spewing out massive flows of black basalt. The whole area was a center of volcanic activity, creating a landscape of wonder framed against the Eastern Sierra Nevadas

To the north is an incredible cinder cone of deep red, gases and minerals forced violently up from the earth’s core through the hole they blasted in its crust. It reminds you that we mindlessly bang around atop a layer of earth floating above a seething bubbling mass of magma and gas. And only 500,000 years ago it swelled from below, shot upwards, rebuilt the landscape. And here I stand simply marveling at it.

There used to be a lake here, and a river. The river ran down the valley, and when a new lava flow sent it coursing across the black basalt, it sought out weaknesses and devoured them, it polished hard surfaces smooth, it carved amazing forms as it fell forty feet down a basalt shelf, and created one of the more amazing things I have ever seen

I tried, and admit I mostly failed, to capture its beauty and the strange fascination of it. Heat radiates from the rocks, flows about them in eddies and swirls as water once did. This place burns your palms with a deep tingling life as you climb into it, it cuts your skin with its razored lines of grace. And from every angle you discover new shadows and curves, a dark unfurling of stone.

There is no water here now, it was stolen, and the land lies arid and dry as you see it, though abounding with life in gorgeous color.

The land itself was stolen from the Paiutes, they irrigated small farms here from a fast running river, and collected obsidian. When first soldiers and then the homesteading act opened up the land to white settlers, small farmers and prospectors moved here, side by side with land speculators.

Frederick Eaton became mayor of Los Angeles in 1898, and appointed his friend William Mulholland as head of the new Los Angeles Department of Water and Power. Together they started what are now fondly known as the California Water Wars. Especially to those who have forgotten that they are ongoing.

LA required water to become the sprawling sucking metropolis that it is today, and the two saw that the Owens Valley had water in abundance. Remember Chinatown? Eaton was a close friend of the agent working for the Bureau of Land Reclamation, who was there to build a network of irigation canals to help small farmers. He bought up much of the land (it all ended up belonging to LA), and Eaton got Teddy Roosevelt to cancel the irrigation project. By 1905 the city of LA had enough land to build the aqueduct through tactics that were varied, creative, and often nefarious. As icing on the cake of venality, the initial run of water went to the San Fernando Valley to water the fields of another close friend, and turn worthless real estate into an agricultural gold mine overnight.

By 1913 the aqueduct was built (it now carries 315 million gallons a day to LA). By 1924 the lake was dry. And in the despair of 1924, 40 men united to dynamite the aqueduct

OwensVly1924

6 moths later residents seized the Alabama Gates spillway and released the water back into the lake. But that was the end of even small victories until the 1990s. The uprising failed as US uprisings always seem to do.

In 1972 LADWP built a second aqueduct, draining surface water. The original vegetation died, and even now the alkali meadows continue to expand. There are salt beds where water used to be, and the wind picks up their dust of carcinogenic nickel, cadmium and arsenic to fling it across the valley. The EPA stated that when the wind blows across the lake bed, this valley becomes the single largest source of particulate matter pollution. In the 1990s and again in 2003, local activists, the Sierra Club and Inyo County won an agreement that a tiny percentage of the water must be diverted back into the valley, but it is tiny…for more on what is being down today take a look at the valiant Owens River Committee.

And read Cadillac Desert by Marc Reisner for the whole story, this is obviously a most horrific simplification.

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