## Abstract A recent interpretation of the structural geology and chronology of the northwestern envelope of the Main Donegal Granite by Hutton (1977) is critically examined. Although many aspects of this analysis are sound, there remains serious doubt concerning Hutton's main conclusion that the
The structural setting of the main donegal granite; a reply to comments on a recent interpretation
✍ Scribed by D. H. W. Hutton
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 198 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0072-1050
No coin nor oath required. For personal study only.
✦ Synopsis
I thank Dr. Berger for his comments on an earlier paper of mine (Hutton 1977) and welcome this opportunity to clarify and expand on various aspects of that work.
Berger (1980) has divided the Creeslough Formation in its type area into a lower 'calcareous' unit (occurring in the SE) and an upper pelitic unit (seen in the NW). On that basis Berger (1980 Figure 1) maintains there is no major repetition by folding of the formation here and that it therefore lies on a single (inverted) limb of the inclined N W facing Enigal Syncline. This reinterpretation is open to a number of criticisms. Firstly the present author's mapping of the area indicates that limestone horizons are common throughout the outcrop of the Creeslough Formation and are not restricted in any general sense to the SE part of it.
Secondly, locating the formation here on one single major fold limb more than doubles its recorded thickness, both in Donegal (310-925 m in Pitcher and Berger
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