Editing Arthur's Seat, Salisbury Crags, Edinburgh - an excursion

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Access to the Holyrood Park is gained by the Park Road Gate and localities 1 to 10 visited in succession. Alternatively from the Holyrood car park the localities can be visited in the order 8 to 10 followed by 1 to 7.
 
Access to the Holyrood Park is gained by the Park Road Gate and localities 1 to 10 visited in succession. Alternatively from the Holyrood car park the localities can be visited in the order 8 to 10 followed by 1 to 7.
  
====1. St Leonard's Crag====
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====1. St. Leonard's Crag====
  
In a low interrupted line of cliffs to the south of the Queen's Drive the St Leonard's Sill is exposed. The central member of Dunsapie basalt, seen elsewhere, is absent and the sill, about 5 m in thickness, consists throughout of a brownish-red, markedly altered mugearite containing sparse plagioclase phenocrysts and small vesicles.
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In a low interrupted line of cliffs to the south of the Queen's Drive the St. Leonard's Sill is exposed. The central member of Dunsapie basalt, seen elsewhere, is absent and the sill, about 5 m in thickness, consists throughout of a brownish-red, markedly altered mugearite containing sparse plagioclase phenocrysts and small vesicles.
  
 
[[File:Arthurs Seat excursion map.jpg|thumb|600px|center|Arthur's Seat, excursion localities.]]
 
[[File:Arthurs Seat excursion map.jpg|thumb|600px|center|Arthur's Seat, excursion localities.]]
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====2. Queen's Drive: Cementstone Group====
 
====2. Queen's Drive: Cementstone Group====
  
On the north side of the Queen's Drive white or pale red sandstones and marls are exposed. Several tons of rock were blasted from this exposure and removed for examination: several fish scales were found and were originally identified as ''Holoptychius nobilissimus'' suggesting that the strata were of Upper Old Red Sandstone age. Re-investigations have cast doubt on this identification and '''Mitchell and Mykura (1962)''' put forward strong evidence that the rocks seen in this outcrop belong to the Cementstone Group.
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On the north side of the Queen's Drive white or pale red sandstones and marls are exposed. Several tons of rock were blasted from this exposure and removed for examination: several fish scales were found and were originally identified as Holoptychius nobilissimus suggesting that the strata were of Upper Old Red Sandstone age. Re-investigations have cast doubt on this identification and Mitchell and Mykura (1962) put forward strong evidence that the rocks seen in this outcrop belong to the Cementstone Group.
  
  
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====6. Cat's Nick: Fault, Quartz-dolerite Dyke====
 
====6. Cat's Nick: Fault, Quartz-dolerite Dyke====
  
At the Cat's Nick a small east—west fault with a downthrow of a metre or so to the north cuts the Salisbury Crags Sill and the underlying sediments. The teschenite close to the fault is much decomposed and shows spheroidal weathering. A few metres farther to the north, a quartz-dolerite dyke traverses the sill. The dyke, about a metre in width, is much finer in grain than the sill and shows a distinct joint pattern. Just above the path it contains a large strip-xenolith of teschenite.
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At the Cat's Nick a small east-west fault with a downthrow of a metre or so to the north cuts the Salisbury Crags Sill and the underlying sediments. The teschenite close to the fault is much decomposed and shows spheroidal weathering. A few metres farther to the north, a quartz-dolerite dyke traverses the sill. The dyke, about a metre in width, is much finer in grain than the sill and shows a distinct joint pattern. Just above the path it contains a large strip-xenolith of teschenite.
  
 
====7. Sill: Upper Contact====
 
====7. Sill: Upper Contact====
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====8. Camstone Quarries: Cementstone Group Sediments====
 
====8. Camstone Quarries: Cementstone Group Sediments====
  
In the disused Camstone Quarries sandstones, shales and cementstones of the Cementstones Group dip eastwards at 25°. Well-developed sun-cracks, ripple-marks and worm-tracks occur and from the cementstones the small crustacean ''Estheria peachi'' has been obtained.
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In the disused Camstone Quarries sandstones, shales and cementstones of the Cementstones Group dip eastwards at 25°. Well developed sun-cracks, ripple-marks and worm-tracks occur and from the cementstones the small crustacean ''Estheria peachi'' has been obtained.
  
 
====9. Crags Vent: Agglomerate====
 
====9. Crags Vent: Agglomerate====

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