Geological Map of Strath, Isle of Skye

D)StratigraphicColumn

Pre

cam

bri

anC

amb

rian

Ord

ovic

ian

Tri

assi

c (

Lat

e)Ju

rass

ic (

Ear

ly)

W E

ApproximateGeologicPeriod

Scale 1:2000

Unconformity

Unconformity

AA*

Quartzite*

T3

T2

T1

LB

AnLL

BRFm

SSFm

20m

IntrusiveIgneousRocks

Basalt

Porphyritic Basalt

Gabbro

Granite

Microgranite

DoleriteD

D

Porphyritic Andesite

P

Suisnish Shale Fm (SSFm)Micaceous shale with calcarenite

Boreraig Fm (BRFm)Bioclastic calcarenite with shale

Allt nan Leac Limestone (AnLL)Micritc limestone with rare blocky, white limestone beds at the base

Camas Malag Dolostone Fm (CMDL)

Dolostone T1Dark grey chert nodules

Dolostone T2White biogenic nodules

Dolostone T3Dark chert bands, often marbleised

Quartzite

Arkosic Arenite

Lithologies

Lime Breccia

Su

isn

ish

Sh

ale

Fo

rmat

ion

Bo

rera

ig F

orm

atio

nA

llt n

an

Lea

c L

imes

ton

eL

ime

Bre

ccia

CM

DL

T3

CM

DL

T2

CM

DL

T1

E)GeneralisedSedimentaryLog

A)LocalityMapofStrath

4 km

Locality Maps: 1. Scotland; 2. Isle of Skye; 3. An aerial view of the study area, Strath. Torrin is located with the

red pin. Top of the page points to north.

Context The Isle of Skye is the largest single landmass in the Inner Hebrides. It is accessed by a roadbridge from Kyle of Lochalsh on the Scottish mainland. The village of Torrin, situated approximately 7 miles west of Broadford, was chosen as the base for the mapping project. It is relatively close to common amenities at Broadford and is also very convenient for the study location at Strath (highlighted). Strath is located at the southern-most tip of Torrin. It covers an area south from the Broadford-Elgol road to the hamlet of Suisnish, on the north coast of Loch Eishort, and east from Loch Slapin to Kilchrist.

A total of six weeks was spent mapping, from 5th July to 14th August 2015. During this time aprroximately 10km2 was studied.

RegionalGeology

The study area is approximately 20miles to the west of the Moine thrust front and lies on the very eastern edge of the Skye Cuillin centre. The Moine thrust cuts a NE-SW trend along the Sleat Peninsula, south-east Skye. The Cuillin centre represents one of a number of Paleogene igneous central complexes in the Hebrides. It is dominated by mafic gabbros however granitic outliers are present such as the Eastern Red Hills, which lie ~1km to the north of the mapped area. These igneous suites were intruded into thick sequences of Triassic-Jurassic sediments, which were themselves deposited on top of Cambro-Ordovician basement.

Facies: 1. Terrigenous2. Lagoonal3. Intertidal4. Reef5. Foreshore6. Open Shelf7. Basinal

Dolomite

Breccia

Limestone

Mudstone/Shale

Sandstone

Key Trans.

Regress.

Lithologies:

Scale 1:10000C)GeologicalCrossSection:TransectLine"A-B-C"

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??

?? ?

??

??

?

U

U

U

U

UU

UU

UU

UU

UU

UU

U U U U U U U U U U U U U U U U U U

B C~22m vertical offset at the intersection with strike-slip fault400

200

0

-200

-400

400

200

0

-200

-400

Ele

vati

on (

met

res)

Elevation

(metres)

A


Basalt

Porphoritic Basalt

Gabbro

Granite

Microgranite

DoleriteD

D

Porphoritic Andesite

P



Allt nan Leac Limestone (ANLL)Micritc limestone with rare blocky, white limestone beds





Quartzite

Arkosic Arenite

Lithologies

KeyAbreviationsB Boudinaged (Dykes)

Structural

21Inclined Strata

Vertical Strata

Horizontal Strata

82 Inclined Joint

Vertical Joint

Thrust; barbs on hanging

wall

Break in Slope; arrowheads denote uphill side

Strike Slip; sinistral motion

Strike Slip; dextral motion

Boundaries

Geological Boundary

Lime Breccia


Basalt

Porphoritic Basalt

Gabbro

Granite

Microgranite

DoleriteD

D

Porphoritic Andesite

P



Allt nan Leac Limestone (ANLL)Micritc limestone with rare blocky, white limestone beds





Quartzite

Arkosic Arenite

Lithologies


Structural

21Inclined Strata

Vertical Strata

Horizontal Strata

82 Inclined Joint

Vertical Joint


wall




Boundaries

Geological Boundary

Lime Breccia

B)SolidRockGeologicalMapOfStrath

0 250 500 1000

Metres

Scale 1:10000

Loch Eishort

N60

Dykes are not to scale and are representative of the relative abundance. Some have been

omitted.

Magnetic declination: -4° 4'

Figure 1: Stereonet diagram showing the overall SW dip of the bedding across the region. The inclination of the beds tends to increase along a S-N traverse. The Broadford anticline is manifested in the northward dipping dolostone beds. Bedding planes are coloured according to lithology. The Camas Malag Dolostone is plotted as one lithology. Arkosic Arenite and Quartzite bedding data are excluded. N= 260.

Loch Slapin

80

80

80

7878

80

74

7968

80

79

77

80

70 84

82

81

52

76

78

82

7260

7064

86

83

75

25

46

69

40

27

20

56

3424

45 58

55

44

20

19

21

16

21

19 20

19

17

14

10

15

18

66

5

5

10

8

4

44

6

62

76

66

83

88

80

38

76

37

25

26

18

60

5656 22

26` 1424

65 41

87

1616 22

3860

82

56

65

74

63

65

BDB

B

D

D

P

D

D

D

D

D

D

A

B

C


Structural

21Inclined Strata

Vertical Strata

Horizontal Strata

82 Inclined Joint

Vertical Joint


wall




Boundaries

Observed Geological Boundary

Inferred Geological Boundary

*ap

pro

xim

ate

min

imu

m t

hic

kn

ess;

no

low

er b

oun

d o

bse

rved

GEOLOGICALMAPOFSTRATH,ISLEOFSKYEChristianGarvey|DepartmentofEarthSciences|DurhamUniversity

July/August2015