I. PARTICULARS OF THE FIND. 



Just beyond the mediajval walls of the town of Wisby, on its southern side, there 

 is a public park extending along the shores of the Baltic. It is called »Palisaderna» 

 (= the palisades) froin some part of the fortifications of the now vanished castle of 

 Wisborg, which fonuerly stood close to this locality. A natural ravine, excavated by 

 the action of water, traverses this park from east to west. It bears the name of Gavn- 

 luelå (= the old brook) or more commonly »Vattenfallet') (= the Waterfall). This ra- 

 vine is iisually dry for the greater part of the year, but in the spring, when there 

 has been plenty of snow on the limestone plateau above, its bed is filled by a stream 

 of water. On the steep slopes of this diminutiva caiion, there is exposed a very cora- 

 plete section, showing the geological structure from the sea level to a point 131 feet 

 above it. In accordance with the usual succession of the strata in the northern part of 

 Gotland, we find at the base, beds of shale, about 50 feet in thickness, followed by layers 

 of limestone and marly shale, which in the lower portion alternate with each other, 

 bu{ gradually the shaly beds disappear, and the upper part of this division, which is 

 in all 70 feet in thickness, is nearly entirely of limestone. At the summit of this di- 

 vision, and near the base of the next succeeding stratum of härd, compact limestone, 

 the fossil scorpion was found in a thin bed of clay, exposed, together with beds of 

 marl, in the low walls of the ravine, just above the road leading from Wisby to Kop- 

 parsvik. The third or highest division of the strata exposed in this ravine, is a härd, 

 compact limestone, called by Murchison the »coralline limestone». It rises towards the 

 interiör of the island and in some places attains a maximum thickness of nearly 100 

 feet. It is there exposed at an elevation of 261 feet above the sea, which would seem 

 to imply for it a still greater thickness, but it must be borne in mind that the strata 

 evidently rise in an upward curve from the shores of the Baltic towards the East, 

 so as to form an arched dome, and the corresponding beds are considerably higher a 

 Swedish mile inland than at the sea shore. Thus the summit of the shale beds near 

 Follingbo church is 150 feet above the sea and the top of the limestone 261 feet. A 

 similar opinion as to the rise of the beds, has been expressed by Dr J. Wallin, in his 

 unpublished report on geological researches in Gotland, who states that in passing east- 

 wards older strata are met with. On the eastern coast of Gotland, on the other hand, the 

 strata can be clearly seen to be sinking, so that at Kräklingbo near Hammars, the beds 

 containing Eurypterus and Ceratiocaris are at the sea level; whilst the corresponding 



