IV. The Extension Westwards of the Necropolis Intrusion
Frederick Mort · Transactions of the Geological Society of Glasgow · 1907
Some time ago Mr. Macnair, F.R.S.E., in exhibiting the Pratt collection of microscopic slides of dolerite recently presented to the Corporation, commented on the resemblance that a section of dolerite from Miller Street bore to the well-known dolerite of the Necropolis. Considerable doubt was expressed as to the identity of the two rocks, and the opinion was given that the Miller Street occurrence was a dyke. Among those who have conducted excavations in this region also this occurrence of whin is known as the Miller Street dyke. The object of the present paper is to examine the evidence bearing on the question, and to endeavour to establish the probability of the Necropolis intrusion extending as far west as Miller Street. There is, of course, no opportunity of obtaining direct field evidence on the matter, as the area in question is completely built up, but indirect field evidence will be given, showing that dolerite occurs in several places between Miller Street and the main body of the intrusion. The Necropolis intrusion consists of a huge mass of dolerite intruded into the Millstone Grit series, and extending for some miles east of Glasgow. The intrusion seems to stop rather abruptly just at the Necropolis, but on the Survey 6-inch map a detached mass of dolerite is shown some distance west of the main rock. From information available since the map was published, it can be shown that this part is not quite accurate. The tunnel of the North British Underground Railway should This 250-word extract was created in the absence of an abstract