Friday, September 17, 2010

Geology can be fun

Thanks to the Baltic woodfire symposium organized by Cassius Clay, yesterday I went on a tour of the island lead by Jesper Larsen, to see evidences of Borholm's unique geology and ceramics history.

The island is cut through by a fault line from Ronne to Nexo separating the basalt rock of the north and the sandstone of the south. Around this central/southern area is where clay was discovered accidentally during repeated attempts of coal mining centuries ago. Oh, yes, there was coal (and also Jurassic fossils and dinosaur remains...) but every attempt to get it out of the ground failed commercially, partially because of pesky clay getting in the way. Finally, and because this isolated land was otherwise not at all fertile and, consequently, its population was very poor, pottery production started up as a means of economic survival. One-man potteries grew into small factories like the Hjorth Fabrik in Nexo we visited with the tour. Hjorth was one of the first workshops to develop wood-firing and stoneware bodies in Denmark. In their museum it has been an eclectic collection of pottery produced during the 200+ years, styles following international trends from Japonism to fajance (yes, they worked with earthenware for a while too). The bread and butter of the pottery was, of course, reliable and plain functional objects in solid yellows, browns, and black for the table, as well as apothecary jars. The workshop still has the old equipment (although most of it is just for show; - I'm pretty sure their clay now comes from the same place in plastic bags like the clay I use here does). Everything was very charming in a nostalgic yet claustrophobic way, as built spaces in Denmark tend to be very small. Seeing the workshop floor, a Japanese artist I was with was enthralled; while I tried to imagine my own sprawling studio practice cramped into this tiny space. On the tour, we also visited a now defunct mega-factory. Its location is still marked by what the kiln shed used to be: a 200 meter long roof structure (amazing timber construction, like an upside down boat!). This was a place for refractory production: ceramics for bricks, tiles, pavers, pipes, etc. A very high fired stoneware varying across the color spectrum from yellow to chocolate brown. The kilns were 70-80 meters long, rail tracks going into them, feeding clay 24/7. The factory was located right next to the stoneware (high temperature) clay deposits in the ground. The company mined the land heavily, creating several pits, which are scattered in the area. Being very close to the sea shore, they had to dump fired ceramic shards on the shore constantly, in order to build a bank preventing sea water to enter the pits. All the pits are now abandoned and filled with water, becoming cute lakes for recreation tourism which is the sole basis of income to the islanders in the present.
At our next stop, also a lake now, we found lots kaolin (the essential ingredient of porcelain). I took samples from two places, one was very plastic, the other one was very white but mixed with coarse sand. My hands and shoes caked with clay, I' was picking up all kinds of rocks and mineral samples all day long, stuffing them next to the camera and notebook in my daypack. By the time we arrived home I must have collected at least 5 kilos of stuff. Some of this went right into the kiln. In two days I can see what this clay looks like and does when baked to 1260 degrees Celsius. The last and most amazing stop on the tour was a part of the coast just south of Ronne. We had to cut through private land (with special permission only,) and climb down a steep path to access this very special and scenic shoreline area. Here in the side of the sand-cliff, there were two kinds of earthenware (very low temperature clay that is saturated with iron) side by side: one is blue-gray and the other is flaming red. And tons - and tons of it; making crackled mounds like a giant's playground. There was also slate and rounded stones of many kinds (I wish I'd know the proper names!): fossilized black wood from the sea, stones that looked like baked chunks of this red clay, and finely layered hunks of compressed sand (something like a sandstone, except this splits easily). Amazing stuff! In the 17th century a fleet of fleeing Swedish boats shipwrecked near this coast. Until present day the sea still delivers something on occasion (sometimes it is silver cups) from these long sunken boats.

All this is not just curious history or a geology lesson. This field trip for me was very much part of the research for my current project... which, I promise, I'll describe in detail in the next post.

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