Gislövshammar møllestensbrud
Gislövshammar mill-stone quarry
Om møllestensbrydningen ved Gislövshammar
Palæontolog Jonas Hagström, Naturhistoriska riksmuseet, svarer her på mit spørgsmål: Hvordan foregik brydningen?
Jeg vil mene, at der er tale om ordovicisk kalksten. For at fungere som møllesten må den indeholde en hel del sand også — ellers slides den for hurtigt ned. Kig på den aflange frie blok til højre. Kalkstenen indeholder horisontale lag af ler og er dermed let at dele op i skiver. Man begyndte med hammer og mejsel at hakke sig ned i en cirkel — og senere frigjorde man den runde blok fra siden gennem nogle af lerlagene. Som det ses på billedet har alle åbninger efter møllestenene den ene side fri, så man kunne bearbejde blokken fra kanten.
Jonas Hagström udpeger i øvrigt en orthoceratit (forstenet blæksprutte) i kalkstenen (i den frie del af periferien af forreste møllestenshul — på tværs i toppen af det trekantede stykke fra venstre). Österlen i Skåne er i det hele taget et interessant område i historisk forstand.
About the millstone carving at Gislövshammar
Paleontologist Jonas Hagström, Swedish Museum of Natural History, answers my question here: How was the carving done?
I would say that it is Ordovician limestone. To function as a millstone, it must contain a lot of sand as well — otherwise it wears down too quickly. Look at the oblong free block on the right. The limestone contains horizontal layers of clay and is thus easy to divide into slices. You started with a hammer and chisel to chop down in a circle — and later you released the round block from the side through some of the clay layers. As can be seen in the picture, all openings after the millstones have one side free, so you could work the block from the edge.
Jonas Hagström also points to an orthoceratite (fossilized squid) in the limestone (in the free part of the periphery of the front millstone hole — across the top of the triangular piece from the left). Österlen in Scania is in general an interesting area in the historical sense.