'THE GEOLOGY AND MINERAL RESOURCES OF DHUFAR PROVINCE, MUSCAT AND OMAN' [‎29r] (47/96)

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of an oil-field must naturally arise, seeing that the Eocene strata of
Bahrein which are more or less on the same structural lines have
become an important source of oil. However, this question will be
dealt with in Section V, Economic Minerals.
Stratigraphical Factors
61. In the list of formations on the geological map
accompanying Dr. Fees’ paper on ‘The Geology and Tectonics of
Oman and of Parts of South-Eastern Arabia’ no less than 15 items
are given, ranging in age from the Murbat Crystallines of Archaean
age to recent deposits such as raised beaches. In the Dhufar area,
however, he recognizes only five formations: (1) the basal crystalline
rock of Murbat; (2) the Murbat sandstones next above; (3) a middle
to upper Cretaceous limestone which is shown right across the Jabal
Samhan, the Jabal Qara and the Jabal Qamer; (4) Eocene limestones
which are shown as flanking the Cenomanian to Senonian limestones
above mentioned, but undifferentiated themselves; and (5) recent
formations largely in the coastal plain of Dhufar.
62. The stratigraphy of the Oman mountains region shows
the following formations according to Dr. Fees:—
Taking the strata from the top (newest formation).
12. Allpvium including the Miliolitic limestone.
11. Miocene (coal-bearing beds) of Sur syncline.
10. Eocene limestones from Dhufar to the gulf of Masira
and along the coast between Muscat and Ras al
Hadd. , .
9. Upper Cretaceous (Maestrichtian) beds of Jabal
Abyadh.
8. Fower Cretaceous to Upper Jurassic (? Neocomian)
Hawasina series around Jabal Akhdar.
7. Fower Cretaceous to Upper Jurassic, Semail Igneous
series of the Western Hajar and Masira island.
6. Upper Jurassic (Portlandian) Musandam limestones.
5. Upper Triassic (Noric) Elphinstone beds.
4. Permian (?) below Jabal Akhdar. . .
3. Permian to Fower Carboniferous (Uralian. Saxonian)
of Saih Hatat and including the Hatat Phyllites. _
2. Cambrian of Qishm and other islands in the Persian
Gulf. . . r
1. Pre-Cambrian or crystalline rocks showing as an mlier
near Kalhat.
63. To the south-west of Dhufar in the Sultanate of Makalla,
Mr. O. H. Fittle recognized the following stratigraphical units.
Recent and Pleistocene including wind-borne sand, alluvial
deposits and raised beaches ;