Home
Volume 23: British Upper Cretaceous Stratigraphy — Chapter 06
 

Click on a chapter to see its illustrations.
Chap 01
17 figures
1 table
Chap 02
49 figures
0 tables
Chap 03
130 figures
1 table
Chap 04
36 figures
0 tables
Chap 05
31 figures
0 tables
Chap 06
35 figures
1 table

Figure 6.1
Main Upper Cretaceous localities in the Inner Hebrides Province; GCR sites are in bold type face.

GCRv23c06f001
Thumbnail (27kb)
LoResJPEG (156kb)
HiResJPEG (1,776kb)
CorelDraw v12 (264kb)

Figure 6.2
Structural elements and volcanic centres affecting Inner Hebrides Upper Cretaceous sedimentation.

GCRv23c06f002
Thumbnail (30kb)
LoResJPEG (356kb)
HiResJPEG (5,983kb)
CorelDraw v12 (95kb)

Figure 6.3
Lithologies in the Upper Cretaceous deposits of the Inner Hebrides. (a) The Clach Alasdair Conglomerate, Clach Alasdair, Eigg. (b) The Thalassinoides bed (arrowed) in white sandstones at Carsaig, Mull. (c) Upper Cretaceous Greensand with phosphatic concretions resting unconformably on Jurassic shales, Clach Alasdair, Eigg. (d) Upper Cretaceous Greensand with phosphatic concretions (arrowed), Clach Alasdair, Eigg. (Photos: R.N. Mortimore.)

GCRv23c06f003
Thumbnail (37kb)
LoResJPEG (583kb)
HiResJPEG (950kb)
TIFF (4,277kb)
GCRv23c06f003a
Thumbnail (31kb)
LoResJPEG (411kb)
HiResJPEG (274kb)
TIFF (476kb)
GCRv23c06f003b
Thumbnail (36kb)
LoResJPEG (477kb)
HiResJPEG (321kb)
TIFF (516kb)
GCRv23c06f003c
Thumbnail (35kb)
LoResJPEG (524kb)
HiResJPEG (351kb)
TIFF (562kb)
GCRv23c06f003d
Thumbnail (35kb)
LoResJPEG (451kb)
HiResJPEG (315kb)
TIFF (516kb)

Figure 6.4
The Auchnacraig Section 1, Mull (see also Figure 6.5).

GCRv23c06f004
Thumbnail (30kb)
LoResJPEG (223kb)
HiResJPEG (1,123kb)
CorelDraw v12 (149kb)

Figure 6.5
Lateral variation in the Upper Cretaceous stratigraphy on Mull illustrated by the Auchnacraig sections and the nearby Torosay section. These sections are near the Great Glen Fault. See also Figure 6.4 for notes on the beds.

GCRv23c06f005
Thumbnail (28kb)
LoResJPEG (302kb)
HiResJPEG (2,073kb)
CorelDraw v12 (344kb)

Table 6.1
The Upper Cretaceous Inner Hebrides Group Succession in Mull.

GCRv23c06t001
Thumbnail (31kb)
LoResJPEG (1,436kb)
HiResJPEG (2,549kb)

Figure 6.6
The Upper Cretaceous GCR sites at Gribun, Mull.

GCRv23c06f006
Thumbnail (31kb)
LoResJPEG (180kb)
HiResJPEG (946kb)
CorelDraw v12 (86kb)

Figure 6.7
Gribun landslip section, (sometimes known as the ‘Gribun Boulder’– Gribun Boulder 1, in the present volume).

GCRv23c06f007
Thumbnail (25kb)
LoResJPEG (297kb)
HiResJPEG (1,334kb)
CorelDraw v12 (66kb)

Figure 6.8
The stratigraphy of the Gribun Stream Boulder, which exposes beds stratigraphically above Gribun Boulder 1.

GCRv23c06f008
Thumbnail (31kb)
LoResJPEG (199kb)
HiResJPEG (841kb)
CorelDraw v12 (53kb)

Figure 6.9
The Gribun Stream Boulder illustrating the stratigraphy of the Chalk and its contact with the overlying sandstones, conglomerate and mudstones. Note, on figure (b) the mudstone is altered, hard (red) and shaly; the sandstone is altered, hard and red, with flint/chalk conglomerate; the greensands have partly turned red forming a flaser structure in the topmost chalk; the cherty chalk is fawn-coloured with saccharoidal silicified, millet-seed sand-fills around the chalk; the dark grey flinty chalk looks like typical flint. (Photos: R.N. Mortimore.)

GCRv23c06f009
Thumbnail (37kb)
LoResJPEG (286kb)
HiResJPEG (1,105kb)
TIFF (5,891kb)
GCRv23c06f009a
Thumbnail (37kb)
LoResJPEG (290kb)
HiResJPEG (380kb)
TIFF (511kb)
GCRv23c06f009b
Thumbnail (34kb)
LoResJPEG (252kb)
HiResJPEG (337kb)
TIFF (482kb)
GCRv23c06f009c
Thumbnail (33kb)
LoResJPEG (299kb)
HiResJPEG (286kb)
TIFF (413kb)

Figure 6.10
Cut slabs showing details of the uppermost 0.5 m of the Gribun Chalk Formation from the Gribun Stream Boulder, Mull.

GCRv23c06f010
Thumbnail (25kb)
LoResJPEG (157kb)
HiResJPEG (2,500kb)
CorelDraw v12 (2,500kb)

Figure 6.11
Second cut slab of the Gribun Chalk Formation from the Gribun Stream Boulder, Mull.

GCRv23c06f011
Thumbnail (31kb)
LoResJPEG (292kb)
HiResJPEG (4,638kb)
CorelDraw v12 (10,759kb)

Figure 6.12
Group I exposures. (a) Northern end of Gribun Boulder 1 (arrowed). (b–f) The Clachandhu Boulders, behind Clachandhu Cottage, at the northern end of Gribun, Mull; (b) Clachandhu Cottage, with the Clachandhu Boulders behind; (c) The First (northernmost) Boulder (Clachandhu Boulder 1), immediately behind cottage; (d) the Second (central) Boulder (Clachandhu Boulder 2) showing the Chalk–red shale contact; (e, f) The Third (most southerly) Boulder (Clachandhu Boulder 3), adjacent to fence showing the contact between greensands and silicified chalk. (Photos: R.N. Mortimore.)

GCRv23c06f012
Thumbnail (35kb)
LoResJPEG (311kb)
HiResJPEG (1,210kb)
TIFF (6,544kb)
GCRv23c06f012a
Thumbnail (28kb)
LoResJPEG (219kb)
HiResJPEG (210kb)
TIFF (312kb)
GCRv23c06f012b
Thumbnail (31kb)
LoResJPEG (297kb)
HiResJPEG (282kb)
TIFF (410kb)
GCRv23c06f012c
Thumbnail (32kb)
LoResJPEG (396kb)
HiResJPEG (366kb)
TIFF (520kb)
GCRv23c06f012d
Thumbnail (34kb)
LoResJPEG (399kb)
HiResJPEG (372kb)
TIFF (517kb)
GCRv23c06f012e
Thumbnail (34kb)
LoResJPEG (390kb)
HiResJPEG (369kb)
TIFF (519kb)
GCRv23c06f012f
Thumbnail (33kb)
LoResJPEG (390kb)
HiResJPEG (363kb)
TIFF (504kb)

Figure 6.13
The stratigraphy of the Clachandhu Boulders at Gribun, Mull. Details of the beds are not as clear as in the Gribun Stream Boulder.

GCRv23c06f013
Thumbnail (29kb)
LoResJPEG (192kb)
HiResJPEG (2,031kb)
CorelDraw v12 (55kb)

Figure 6.14
Panoramic view looking east over the southern end of Gribun and The Wilderness. The Mesozoic rocks form the flatter farmland in the foreground. Tertiary basaltic lavas form the high crags and plateaus and the Upper Cretaceous deposits are found in intermittent slivers beneath the basalts. (Photomosaic: R.N. Mortimore.)

GCRv23c06f014
Thumbnail (29kb)
LoResJPEG (360kb)
HiResJPEG (899kb)
TIFF (5,291kb)
GCRv23c06f014a
Thumbnail (23kb)
LoResJPEG (540kb)
HiResJPEG (352kb)
TIFF (678kb)
GCRv23c06f014b
Thumbnail (22kb)
LoResJPEG (529kb)
HiResJPEG (351kb)
TIFF (714kb)

Figure 6.15
(a, b, c) Allt na Teangaidh, Gribun, Mull, looking north-west from the pass above the waterfalls to the Island of Inch Kenneth where a thick succession of Triassic sediments is present. (Photomosaics: R.N. Mortimore.)

GCRv23c06f015
Thumbnail (31kb)
LoResJPEG (381kb)
HiResJPEG (1,069kb)
TIFF (2,372kb)
GCRv23c06f015a
Thumbnail (27kb)
LoResJPEG (413kb)
HiResJPEG (330kb)
TIFF (586kb)
GCRv23c06f015b
Thumbnail (33kb)
LoResJPEG (270kb)
HiResJPEG (442kb)
TIFF (652kb)
GCRv23c06f015c
Thumbnail (27kb)
LoResJPEG (215kb)
HiResJPEG (209kb)
TIFF (326kb)

Figure 6.16
The Gribun Group III exposures, Allt na Teangaidh stream bed, Mull.

GCRv23c06f016
Thumbnail (29kb)
LoResJPEG (265kb)
HiResJPEG (2,046kb)
CorelDraw v12 (101kb)

Figure 6.17
Details from the Gribun sandstones. (a) Base of the Allt na Teangaidh section; greensands pass up into laminated beds and the calcareous nodular bed. (b) Abundant Rhynchostreon oyster horizon in a Balmeanach sandstone boulder. (Photos: R.N. Mortimore.)

GCRv23c06f017
Thumbnail (37kb)
LoResJPEG (294kb)
HiResJPEG (1,253kb)
TIFF (6,486kb)
GCRv23c06f017a
Thumbnail (34kb)
LoResJPEG (431kb)
HiResJPEG (392kb)
TIFF (522kb)
GCRv23c06f017b
Thumbnail (36kb)
LoResJPEG (350kb)
HiResJPEG (330kb)
TIFF (491kb)

Figure 6.18
The Caisteal Sloc nam Ban section in The Wilderness, Mull. Section drawn as a weathered profile of the rock exposure, not as a sedimentological grain-size profile.

GCRv23c06f018
Thumbnail (28kb)
LoResJPEG (248kb)
HiResJPEG (1,976kb)
CorelDraw v12 (56kb)

Figure 6.19
The most southerly Upper Cretaceous? or basal Palaeocene section in Gribun at Caisteal Sloc nam Ban, Mull, showing two conglomerates separated by a thick ‘white’, millet-seed sandstone unit. The lower conglomerate is a mixture of silicified chalk fragments and well-rounded quartz pebbles and cobbles, all poorly sorted, and containing sand/gravel lenses. The upper conglomerate is primarily composed of flints including red flints. (a, b, c) Upper section beneath Tertiary basalts, the poorly sorted flint conglomerates including red and green coloured flints. (d, e, f) Lower section with the waterfall on the white sandstone and the under-cut section in a silicified chalk quartz sand and gravel deposit, which thickens in a wedge from beyond the waterfall towards the geologist. Many Upper Cretaceous fossils are present in the reworked chalky material. (Photos: R.N. Mortimore.)

GCRv23c06f019
Thumbnail (41kb)
LoResJPEG (427kb)
HiResJPEG (1,521kb)
TIFF (6,885kb)
GCRv23c06f019a
Thumbnail (37kb)
LoResJPEG (414kb)
HiResJPEG (389kb)
TIFF (522kb)
GCRv23c06f019b
Thumbnail (37kb)
LoResJPEG (427kb)
HiResJPEG (396kb)
TIFF (531kb)
GCRv23c06f019c
Thumbnail (38kb)
LoResJPEG (421kb)
HiResJPEG (396kb)
TIFF (538kb)
GCRv23c06f019d
Thumbnail (34kb)
LoResJPEG (403kb)
HiResJPEG (372kb)
TIFF (506kb)
GCRv23c06f019e
Thumbnail (36kb)
LoResJPEG (442kb)
HiResJPEG (401kb)
TIFF (520kb)
GCRv23c06f019f
Thumbnail (37kb)
LoResJPEG (442kb)
HiResJPEG (409kb)
TIFF (539kb)

Figure 6.20
Two views of the Carsaig sections. (a) Sections above Carsaig House include the waterfall (arrowed). (b) Upper Cretaceous sections (arrowed) north-west of Carsaig beneath basalts and above Jurassic sandstones and shales. (Photos: R.N. Mortimore.)

GCRv23c06f020
Thumbnail (31kb)
LoResJPEG (254kb)
HiResJPEG (1,173kb)
TIFF (6,653kb)
GCRv23c06f020a
Thumbnail (29kb)
LoResJPEG (394kb)
HiResJPEG (264kb)
TIFF (448kb)
GCRv23c06f020b
Thumbnail (27kb)
LoResJPEG (309kb)
HiResJPEG (217kb)
TIFF (398kb)

Figure 6.21
Upper Cretaceous sections at Carsaig, Mull. The far western gully section.

GCRv23c06f021
Thumbnail (28kb)
LoResJPEG (223kb)
HiResJPEG (1,736kb)
CorelDraw v12 (66kb)

Figure 6.22
Carsaig main gully section, Mull.

GCRv23c06f022
Thumbnail (28kb)
LoResJPEG (223kb)
HiResJPEG (1,275kb)
CorelDraw v12 (196kb)

Figure 6.23
Feorlin Cottage tributary stream section on the east side of Abhainn na Feorlin section under the waterfall, below the road, Carsaig, Mull.

GCRv23c06f023
Thumbnail (34kb)
LoResJPEG (331kb)
HiResJPEG (860kb)
CorelDraw v12 (93kb)

Figure 6.24
Feorlin Cottage main stream section above the waterfalls formed on massive white sandstone.

GCRv23c06f024
Thumbnail (28kb)
LoResJPEG (167kb)
HiResJPEG (837kb)
CorelDraw v12 (103kb)

Figure 6.25
Possible correlation of the Upper Cretaceous sections at Carsaig, Mull.

GCRv23c06f025
Thumbnail (28kb)
LoResJPEG (213kb)
HiResJPEG (2,736kb)
CorelDraw v12 (451kb)

Figure 6.26
Three Carsaig exposures. (a) North-west of Carsaig, abundant oyster-shell beds (OSB) at the top, and base of, the sandstone are arrowed (see also Figure 6.25, western gully section). (b) Above Carsaig House, showing an abundant oyster-shell bed (OSB) at the top of the sandstone, and a concretionary bed (CB) at the base of the sandstone. (c) Feorlin Cottage upper stream section. An upper band of chalk/flint separating two sandstone units is arrowed. (Photos: R.N. Mortimore.)

GCRv23c06f026
Thumbnail (38kb)
LoResJPEG (371kb)
HiResJPEG (1,575kb)
TIFF (7,460kb)
GCRv23c06f026a
Thumbnail (33kb)
LoResJPEG (344kb)
HiResJPEG (340kb)
TIFF (557kb)
GCRv23c06f026b
Thumbnail (36kb)
LoResJPEG (266kb)
HiResJPEG (298kb)
TIFF (517kb)
GCRv23c06f026c
Thumbnail (36kb)
LoResJPEG (495kb)
HiResJPEG (330kb)
TIFF (542kb)

Figure 6.27
A possible correlation of the Gribun sections, Mull.

GCRv23c06f027
Thumbnail (32kb)
LoResJPEG (297kb)
HiResJPEG (2,826kb)
CorelDraw v12 (215kb)

Figure 6.28
The Morvern Upper Cretaceous GCR sites at Beinn Iadain and Beinn na h-Uamha.

GCRv23c06f028
Thumbnail (31kb)
LoResJPEG (178kb)
HiResJPEG (897kb)
CorelDraw v12 (263kb)

Figure 6.29
Upper Cretaceous GCR Sites at Morvern, Argyll, the main Beinn Iadain section on the south-east corner. (Figure 6.28, Section 1; re-measured 1998 by R.N. Mortimore and C.J. Wood.)

GCRv23c06f029
Thumbnail (29kb)
LoResJPEG (273kb)
HiResJPEG (3,058kb)
CorelDraw v12 (112kb)

Figure 6.30
Small, faulted outlier of Upper Cretaceous sediments on the west bank of Coire Riabhach, north-east side of Beinn Iadain, Morvern, north-west Highlands, Scotland. (a) Panoramic view of the north side of Beinn Iadain. (b) A view across the main exposure on the north-east side of Beinn Iadain looking south-west. (c) Detail of the upper part of the section, which in downwards order consists of amygdaloidal basalt lava, baked mudstones, lignite with coarse flint pebbles, sandstone and flint conglomerate, thin lignitic mudstone, white cherty chalk and greensands with phosphate layers (see Figure 6.31). (d, e) Details of the conspicuous rib of white chalk. (f) Photo turned on its side showing the white sandstone and beds below including the Trias (see Figure 6.31). (Photomosaics: R.N. Mortimore.)

GCRv23c06f030
Thumbnail (31kb)
LoResJPEG (568kb)
HiResJPEG (1,165kb)
TIFF (5,681kb)
GCRv23c06f030a
Thumbnail (22kb)
LoResJPEG (322kb)
HiResJPEG (199kb)
TIFF (455kb)
GCRv23c06f030b
Thumbnail (35kb)
LoResJPEG (412kb)
HiResJPEG (380kb)
TIFF (519kb)
GCRv23c06f030c
Thumbnail (22kb)
LoResJPEG (1,064kb)
HiResJPEG (693kb)
TIFF (1,330kb)
GCRv23c06f030d
Thumbnail (34kb)
LoResJPEG (318kb)
HiResJPEG (405kb)
TIFF (532kb)
GCRv23c06f030e
Thumbnail (35kb)
LoResJPEG (448kb)
HiResJPEG (406kb)
TIFF (538kb)
GCRv23c06f030f
Thumbnail (24kb)
LoResJPEG (852kb)
HiResJPEG (452kb)
TIFF (791kb)

Figure 6.31
The stratigraphy of the Coire Riabhach stream section, Beinn Iadain, Morven. (Measured by R.N. Mortimore, 1999.)

GCRv23c06f031
Thumbnail (28kb)
LoResJPEG (220kb)
HiResJPEG (1,673kb)
CorelDraw v12 (52kb)

Figure 6.32
The Upper Cretaceous deposits of the Lochaline Mine Adit section, Lochaline, Morvern. The Gribun Chalk Formation probably incorporates the Clach Alasdair Conglomerate and lignites.

GCRv23c06f032
Thumbnail (26kb)
LoResJPEG (175kb)
HiResJPEG (1,558kb)
CorelDraw v12 (62kb)

Figure 6.33
Correlation of the Upper Cretaceous GCR sites at Morvern, Argyll, the main Beinn Iadain sections linked to Lochaline.

GCRv23c06f033
Thumbnail (28kb)
LoResJPEG (223kb)
HiResJPEG (2,736kb)
CorelDraw v12 (467kb)

Figure 6.34
Correlation of the Upper Cretaceous GCR sites in the Inner Hebrides at Morvern, Argyll (Beinn Iadain and Lochaline) and at Auchnacraig, Carsaig, and Gribun, Mull. Note the restructuring of the lithostratigraphy of the Inner Hebrides Group.

GCRv23c06f034
Thumbnail (27kb)
LoResJPEG (365kb)
HiResJPEG (3,830kb)
CorelDraw v12 (963kb)

Figure 6.35
A composite Antrim Hibernian Greensand Formation succession, Northern Ireland, based on stratotypes of component members. The equivalent of the Cenomanian Greensand of the Inner Hebrides sections at Carsaig, Gribun etc. with large Amphidonte is also present in Northern Ireland. The Colinwell Sands Member, which is only locally preserved in Northern Ireland, may equate with the Inner Hebridean Lochaline White Sandstone Formation. The lower part is correlatable in detail with the Mull and Morvern sections as it contains similar concretionary and burrow beds overlying similar bands of oyster shells. There is also a strong similarity in fossil content (particularly sponges), between the Beinn Iadain phosphatic sandy marl, and the Cloghfin Sponge Beds of Northern Ireland. These beds are followed by the onset of real chalk in both areas.

GCRv23c06f035
Thumbnail (27kb)
LoResJPEG (377kb)
HiResJPEG (3,802kb)
CorelDraw v12 (869kb)

XML solutions by J S Publications