North of the more well-known natu­re reser­ve Nohl­mar­ken is a small reser­ve cal­led Skultorpsprofilen.

It is an old limesto­ne quar­ry whe­re lar­ge quan­ti­ti­es of tufa have for­med along the quar­ry walls. The natu­re reser­ve has been pro­tec­ted sin­ce 1927 becau­se of its spe­ci­al geo­lo­gy. The limesto­ne quar­ry con­ti­nues to the south and tufa is abun­dant throughout. 

Tufa is a white or yel­lowish porous rock that con­si­sts of cal­ci­um car­bo­na­te. It is for­med when water dis­sol­ves cal­ci­um as it flows through cal­ca­re­ous rock. As the alka­li­ne water reaches the sur­fa­ce, cal­ci­um car­bo­na­te is pre­ci­pi­ta­ted. The pre­ci­pi­ta­te can encapsu­la­te plants and other mate­ri­als that hap­pen to be in its path. When the­re is much pre­ci­pi­ta­tion, it will cre­a­te tufa and it may con­tain plant parts and other objects. This pro­cess shows us how fos­sils are cre­a­ted. When the bio­lo­gi­cal mate­ri­al has disap­pe­a­red, the imprints are left as cavi­ti­es in the tufa. The­se imprints are often very detai­led, and stu­di­es of plant imprints in tufa have been of gre­at impor­tan­ce to our understan­ding of how our flo­ra wan­de­red in.

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