0 5 10 15 20 25 0.0 0.2 0.4 0.6 0.8 1.0

Volkova

Julie

Johnson

Hayashi

Tolgonay

Outi

Hull

Obukhova

Duncan

Indira

Golubkina

Katya

Olya

Cotton

Zdravka

Natalia

Margit

Montessori

Ilbis Fossae

Atropos Tessera

Minerva Fossae

Virilis Tesserae

Lampedo Linea

Senectus Tesserae

Utrenitsa

Metis

Mons

Bagbartu

Mons

Ale

Tholus

Nertus

Tholus

Mokosha

Mons

Hemera Dorsa

Bachue Corona

Feronia Corona

Ben Dorsa

Azham

Corona

Varma-Ava Dorsa

Upunusa

Tholus

Otau

Corona

Okipeta Dorsa

Rananeida

Corona

Bau Corona

Demeter Corona

Varma-Ava Dorsa

Charykh-Keyok Dorsa

Iyele Dorsa

Atira

Mons

Coatlicue

Corona

LIBUŠE

PLANITIA

KAWELU PLANITIA

GUINEVERE PLANITIA

Vallis

Hayashi

Outi

Indira

Golubkina

Olya

Cotton

Natalia

Margit

Montessori

Virilis Tesserae

Lampedo Linea

Metis

Mons

Bagbartu

Mons

Mokosha

Mons

Bachue

Corona

Feronia

Corona Azham

Corona

Otau

Corona

Rananeida

Corona

Bau Corona

Demeter

Corona

Atira

Mons

Coatlicue

Corona

LIBUŠE

PLANITIA

KAWELU PLANITIA

GUINEVERE PLANITIA

Outi

Indira

Natalia

Margit

Montessori

Virilis Tesserae

Lampedo Linea

Metis

Mons

Bagbartu

Mons

Mokosha

Mons

Bachue

Corona

Feronia

Corona Azham

Corona

Otau

Corona

Rananeida

Corona

Bau Corona

Atira

Mons

Coatlicue

Corona

LIBUŠE

PLANITIA

KAWELU PLANITIA

Hayashi

Indira

Golubkina

Olya

Cotton

Montessori

Demeter Corona

GUINEVERE PLANITIA

mA1

mA2

mMo1

mMo2

mMe1

mMe2

mB1

mB2

mu p4

p2

p1

p3

pd c cf

t

cA2

cBa cBu cR cC cD cO

cA1

cF2

cF1

p3

cf

p3

cBa

p4

p4

p3

p4

p2

mMe2

mu

pd

pd

pd

mMe1

p2

p1

p3

p4

p1

p3

p2

p2

p2

mMe2

mMe1

p1

p1

p3

p3

p2

p2

p4

p3

p1

p2

p2

p2

p2

p3

mMo2

pd

p3

p4

t

p2

p4

t

t

t

p3

p1

p2

p4

p4

p4

p2

p4

p4

p3

mu

mB2

p3

p3

p1

p3

p4

c

cf

cC

cC

mu

p2

p2

p3

p3

p2

p2

p1

p1

p1

p1

p2

p4

p3

p2

p2

t

p3

p1

p4

p2

p1

p2

p1

p1

c

p1

p3

p2

p3

p3

p3

p3

p3

p3

p2

c

c

cf

cO

mu

cf

p2

p2

p2

p2

p2

p4

p2

p4

p4

mu

p3

p2

p2

c

c

cf

p4

p1

p1

p2

p3

p2

p3

p3

p4

p2

p1

c

p4

p2

p2

p1

p1

p c 3

p4

p4

cR

p2

p2

p2

p3

p3

p2

p1

p3

pd

p3

p4

c

p1

p2

p3

p2

p4

p4

p4

p4

p4

p3

p4

p4

p4

p2

p2

p2

p3

p3

p3

p3

p3

pd

p1

p1

p4

p3

p2

p3

p2

p1

p1

p3

p3

p3

c

p3

p3

p4

p4

p2

p2

p1

p1

mB1

mB1

mB1

p4

p3

p2

p3

p1

p1

cA2

p4

cF2

cF2

mB1

cF1

p2

cA1

p3

p3

p2

p1

p1

cA2

p2

p3

p1

p1

p2

p3

p3

p3

p3

p3

p3

p4

t

p1

t

t

mu

t

p3

p1

t

t

t

t

t

t

t

t

p2

p2

p2

p3

p2

cf

c

c

p1

p4

p2

c

p4

cBa

t

t

mMe2

mMo1

mA1

mu

mA2

cR

cR

c

cR

cf

mu

cD

cBu

p1

p4

cBu

c

cf

mB2

mMe2

mMo2

mA2

mu

mB1

mMe1

mMo1

mA1

pd

p4

p3

p2

p1

cA2

cF2

t

cF1

cBa

cBu

cR

cC

cD

cO

cA1

SCALE 1:4 711 886 (1 mm = 4.712 km) AT 25° LATITUDE

1:5 000 000 AT 34° and 73° LATITUDES

LAMBERT PROJECTION

50

60

75

70

65

55

500 400 300 200 100 0 100 200 300 400 500 KILOMETERS

265°

270°

280°

285°

290°

295°

300°

270° 265°

275°

240°

245°

250°

255°

260°

75°

240°

50°

260°

255°

250°

245°

300°

295°

290°

285°

280°

275°

55°

60°

65°

70°

75°

65°

60°

55°

50°

MONS MATERIALS CORONA MATERIALS

PLAINS

MATERIALS

TESSERA

MATERIALS

CRATER

MATERIALS KEY

Timing of lower contact 

unknown

Timing successive 

contact

Timing transgressive 

contact

Lateral contact suggests 

temporal association

No lateral contact; temporal 

association unknown

Timing of upper contact 

unknown

Sawteeth indicate emplacement of unit is 

loosely constrained versus that of 

adjacent units.

Length of unit box does not imply length 

of time of deposition.

DESCRIPTION OF MAP UNITS

The units are grouped according to types and arranged from youngest to oldest in 

each grouping. Age relations are described in the text, portrayed in the correlation 

chart of map units, and documented in full detail in table 5. Structural associations 

are included in the following descriptions where they are integrally related to the 

definition and interpreted formation of the unit. Unit symbols are applied to denote 

unit group, physiographic name (where relevant), and stratigraphic order, as follows: 

(1) the unit group is shown by a lower-case letter (m, mons materials); (2) the 

physiographic feature that is discretely related to the unit is shown by an upper-case 

letter (B, Bagbartu Mons); (3) successive lower-case letters are used to differentiate 

between features that begin with the same letter (Ba, Bachue Corona, versus Bu, 

Bau Corona); and (4) subscript numbers denote sequential subdivisions based on 

crosscutting relations (see table 5 for details). Thus, the geologic symbol mMe2

denotes the younger Metis Mons material unit and the geologic symbol cD denotes 

the Demeter Corona material unit.

MONS MATERIALS

Materials predominantly defined by overlapping lobate margins and digitate terminations and generally confined to discrete physiographic features

Younger Bagbartu Mons material—Low-backscatter plains-like material within summit caldera of Bagbartu Mons. Contains multiple 

small volcanic edifices and several north-south-trending lineaments 

of moderate to high backscatter. Laterally grades into older 

Bagbartu Mons material (unit mB1). Interpretation: Smooth lava 

flows sourced from local small volcanic edifices and fractures and 

emplaced during and after evacuation of underlying magma 

chamber. Lateral gradations suggest time-transgressive relations 

with adjacent, older Bagbartu Mons material. May represent youngest phase of magmatic activity at Bagbartu Mons

Younger Metis Mons material—High- to moderate-backscatter material with dense, complexly overlapping lobes oriented radial to the 

Metis Mons summit. Axis defined by northwest-southeast-trending 

lineaments of Ilbis Fossae, with superposed clusters of small volcanic edifices. Long lobes embay Ben Dorsa to the east and Coatlicue 

Corona to the north. Interpretation: Rough to smooth lava flows 

sourced from Ilbis Fossae and superposed small volcanic edifices. 

May represent a late-stage phase of edifice-building volcanic activity at Metis Mons

Younger Mokosha Mons material—Low-backscatter, plains-like 

material at topographic summit of Mokosha Mons. Contains 

multiple small volcanic edifices and few north-south-trending 

lineaments of moderate to high backscatter. Laterally grades with 

older Mokosha Mons material (unit mMo1). Interpretation: 

Smooth lava flows sourced from local small volcanic edifices and 

fractures associated with surrounding high-standing fractured 

annulus (units p1 and p2) and emplaced during and after evacuation 

of underlying magma chamber. Lateral gradations suggest timetransgressive relation with the adjacent, older Mokosha Mons material. May represent youngest phase of magmatic activity at 

Mokosha Mons

Younger Atira Mons material—Low-backscatter, plains-like material 

located within the summit caldera of Atira Mons. Contains multiple 

small volcanic edifices and few moderate-backscatter wrinkle 

ridges oriented circumferential to summit caldera. Laterally grades 

with older Atira Mons material (unit mA1). Intepretation: Smooth 

lava flows sourced from local small volcanic edifices during and 

after evacuation of an underlying magma chamber. May represent 

youngest phase of magmatic activity at Atira Mons

Mons material, undivided—High- and low-backscatter material 

formed primarily by overlapping lobes with digitate margins and 

terminations. Not strictly associated with major mons-forming 

edifices. Often occurs as localized patches with ambiguous stratigraphic relations with plains units. Contains small volcanic vents 

and lineaments. Largest outcrop forms unnamed mons-like edifice 

located south of Bagbartu Mons and east of Coatlicue Corona (lat 

61.7° N., long 280.3° E.). Interpretation: Rough to smooth lava 

flows sourced from local small volcanic edifices and fractures. May 

represent long lobes from major mons-forming edifices that were 

disconnected by burial from plains unit 4 (unit p4)

Older Bagbartu Mons material—High- to low-backscatter material 

with dense, complexly overlapping lobes oriented radial to the 

Bagbartu Mons summit. Long lobes extend to the east and west. 

Proximal to the summit, unit contains multiple north-south-trending 

lineaments of moderate to high backscatter and few small volcanic 

edifices. Distal to summit, unit contains multiple wrinkle ridges 

oriented in a reticulate pattern. Interpretation: Rough to smooth lava 

flows sourced from summit caldera, local fractures, and small volcanic edifices. Represents primary edifice-building phase(s) of volcanic activity at Bagbartu Mons. North-south-trending lineaments may 

be reactivated fractures associated with currently buried ridge and 

fracture belt that connected Feronia and Coatlicue Coronae

Older Metis Mons material—Moderate backscatter material that forms 

irregularly shaped and isolated outcrops near the summit of Metis 

Mons. Contains northwest-southeast-trending lineaments of Ilbis 

Fossae, as well as kilometer-scale hummocks and few small volcanic edifices. Bright to moderately dark radar backscatter; texture 

mottled to speckled. Interpretation: Kipukas of deformed lava 

flows likely sourced from Ilbis Fossae that formed during early 

phases of edifice-building volcanic activity at Metis Mons

Older Mokosha Mons material—High- to low-backscatter material 

with complexly overlapping lobes oriented radial and circumferential to the summit of Mokosha Mons. Long lobes extend to the 

northwest toward Okipeta Dorsa. Contains clusters of small volcanic edifices and north-south-trending lineaments. Interpretation: 

Rough to smooth lava flows sourced from small volcanic edifices 

and fractures. Lobe orientations implicate eruption from both highstanding fractured plains materials near the summit of Mokosha 

Mons and from a cluster of small volcanic edifices located to the 

northwest (lat 58.6° N., long 250.0° E.). Represents primary 

edifice-building phase(s) of volcanic activity at Mokosha Mons

Older Atira Mons material—High- and low-backscatter material with 

dense, complexly overlapping lobes oriented radial to the summit 

depression of Atira Mons. Contains some wrinkle ridges oriented 

parallel to those that occur on surrounding plains. Interpretation: 

Rough to smooth lava flows sourced from the summit caldera. 

Represents primary edifice-building phase(s) of volcanic activity at 

Atira Mons

PLAINS MATERIALS

Widespread patches of variable backscatter materials in low-lying plains between 

major topographic features (for example, mons and coronae); lobate flows rare and 

(or) indistinct

Plains dome material—High- to moderate-backscatter features 

composed of isolated circular to subcircular domes with gently 

sloping, steep-sided, and scalloped margins. Occurs in moderate- to 

low-backscatter plains and younger mons units. Contains no 

discernible tectonic structure. Includes Nertus Tholus. Interpretation: Constructs possibly formed through a range of primary and 

(or) secondary volcanic processes, such as localized effusive volcanism and (or) caldera collapse

Plains unit 4—Moderate- to low-backscatter materials that form parts of 

low-lying plains between major topographic features, including 

Guinevere Planitia, as well as regions surrounding Varma-Ava and 

Ben Dorsa and Bagbartu Mons. Also occurs in a high-standing plain 

that forms the center of Bau Corona. High-backscatter surfaces 

occur locally, mostly in proximity to older plains units. Outcrops 

range from tens of kilometers to >1,000 km in diameter. Contains 

sparse to dense collections of wrinkle ridges and lineaments 

(oriented in intersecting, reticulate, and anastomosing patterns), a 

few isolated and clustered small volcanic edifices, and subdued 

topographic warps. Includes parts of Utrenitsa Vallis and isolated, 

high-backscatter outcrop of hummocky material adjacent to plains 

dome material (unit pd). Locally forms floors of impact craters. 

Interpretation: Moderately deformed lava plains of recent relative 

age. Chiefly composed of complexly overlapping flows with low to 

moderate surface roughness and sourced from multiple features 

throughout the quadrangle, including mons, coronae, ridge and 

fracture belts, and small volcanic edifices. Likely includes surficial 

materials including volcaniclastic and impact-related materials, 

microdunes, and landslide deposits. Structures likely represent 

late-stage or waning extensional and contractional deformation, 

perhaps related to regional and (or) global stresses. Outcrops on 

crater floors clearly postdate crater formation and may be lava 

plains emplaced by eruption along impact-related fractures.

Plains unit 3—High- to low-backscatter materials that form the areal 

bulk of low-lying plains between major topographic features, 

including Kawelu, Guinevere, and Libuše Planitiae, as well as 

regions surrounding Atropos, Virilis, and Senectus Tesserae and 

Okipeta Dorsa. Outcrops range from tens of kilometers to >1,000 

km in diameter. Occurs as small outcrops in older, heavily deformed 

plains units around most coronae. Contains dense collections of 

wrinkle ridges and lineaments (oriented in intersecting, reticulate, 

and anastomosing patterns, commonly around major topographic 

features), multiple clusters of small volcanic edifices, and 

topographic warps. Forms the ellipsoidal annulus of Demeter 

Corona. Includes parts of Utrenitsa Vallis. Locally appears to grade 

with older plains units. Interpretation: Moderately to highly 

deformed lava plains of intermediate relative age. Chiefly 

composed of complexly overlapping flows with highly variable 

surface roughness and sourced from multiple locations throughout 

the quadrangle, including mons, coronae, ridge and fracture belts, 

and small volcanic edifices; broad textural and morphologic homogeneity limits confident association with particular source of 

eruption or center of tectonic deformation. Structures likely represent intermediate-stage extensional and contractional deformation, 

which partly contributed to the growth of ridge and fracture belts 

and topographic warps, including Demeter Corona

Plains unit 2—High- to moderate-backscatter materials that form 

irregularly shaped outcrops both within and adjacent to major 

topographic features, including Rananeida and Feronia Coronae, 

Lampedo Linea, Mokosha Mons summit depression, Atropos 

Tessera, and most ridge and fracture belts. Outcrops typically tens 

to hundreds of kilometers in diameter. Contains dense collections of 

wrinkle ridges and lineaments and a few small volcanic edifices. 

Includes sparse outcrops of low backscatter. Interpretation: Highly 

deformed lava plains of intermediate to old age. Tectonic deformation has almost entirely obliterated evidence of the unit’s primary 

composition, morphology, and (or) source. Occurrence of intersecting extensional and contractional structures implicates diverse, 

long-lived, and repeated tectonism, perhaps related to initial growth 

and subsequent deformation of major ridge and fracture belts, 

corona, and topographic warps

Plains unit 1—Very high backscatter to high-backscatter materials that 

form densely lineated, irregularly shaped outcrops both within and 

adjacent to major topographic features, including Lampedo Linea 

and all larger coronae, dorsa, and tesserae. Outcrops typically tens 

to hundreds of kilometers in diameter. Characteristically contains 

very dense collections of wrinkle ridges and lineaments, in places 

approaching structural characteristics of tessera. Interpretation: 

Composite structural unit that consists of very highly deformed 

lava plains and vestigial corona materials of relatively ancient age 

and indeterminate origin and physiographic association. Tectonic 

deformation has entirely obliterated evidence of unit’s primary 

composition, morphology, and (or) source. May underpin some 

mons features and spatially and temporally grade with some 

tessera material. Occurrence of complexly intersecting extensional 

and contractional structures implicates diverse, long-lived, and 

repeated tectonism, likely related to initial growth and subsequent 

deformation of major ridge and fracture belts, corona, and 

topographic warps

CORONA MATERIALS

Isolated, densely lineated materials that make up individual coronae. Due to structural complexity of corona material and its defining nature to that unit, symbols 

depicted within the boundaries of the unit are intended to convey the local type and 

trend of tectonic structure

Younger Azham Corona material—High- to moderate-backscatter 

material composed of lineated material interspersed with moderateto low-backscatter material. Makes up core and bulk of annulus and 

topographic warps that define Azham Corona. Contains abundant 

lineaments and one topographic depression. Interpretation: Lavas 

sourced from fractures of Azham Corona, partly deformed by 

extension, perhaps related to late-stage corona uplift

Younger Feronia Corona material—Moderate- to low-backscatter 

material within topographic lows that centered on Feronia Corona. 

Grades in places with adjacent, older Feronia Corona material (unit 

cF1). Contains some lineaments generally oriented radial to underlying corona. Interpretation: Moderately deformed lava plains 

sourced from fractures within Feronia Corona

Bachue Corona material—Very high backscatter material chiefly 

composed of dense systems of ridges and lineaments. Makes up 

entirety of ridge and fracture belts that define northern annulus of 

Bachue Corona. Ridges oriented circumferential to Bachue Corona. 

Interpretation: Lava plains heavily deformed by contraction and 

extension of the corona annulus

Bau Corona material—Very high backscatter material chiefly 

composed of dense systems of ridges and lineaments of the southwestern and central parts of Bau Corona. Partly forms topographic 

warp that defines southern part of corona annulus. Includes few 

irregularly shaped outcrops within younger plains material. Interpretation: Lava plains heavily deformed by contraction and extension of corona annulus

Rananeida Corona material—Very high backscatter to high backscatter material chiefly composed of dense systems of ridges and lineaments. Forms southern and southeastern parts of annulus of 

Rananeida Corona. Irregularly shaped outcrops form core of 

corona. Interpretation: Lava plains heavily deformed by corona 

contraction and extension

Coatlicue Corona material—Very high backscatter to high backscatter 

material that makes up the irregular annulus of Coatlicue Corona. 

Contains dense systems of ridges and lineaments. Grades in places 

with adjacent older plains units. Interpretation: Lava plains heavily 

deformed by corona contraction and extension

Demeter Corona material—Moderate-backscatter material that makes 

up eastern annulus of Demeter Corona. Contains multiple northsouth-trending lineaments generally oriented circumferential to the 

corona. Interpretation: Lava plains heavily deformed by corona 

contraction and extension

Otau Corona material—High-backscatter material that makes up the 

bulk of Otau Corona. Contains dense systems of radial and concentric ridges and fractures. Interpretation: Lava plains heavily 

deformed by corona contraction and extension

Older Azham Corona material—Very high backscatter to high 

backscatter material that makes up northeastern and part of western 

margins of Azham Corona. Grades in places with adjacent, younger 

Azham Corona material (unit cA2). Forms broad, northwestsoutheast-trending topographic warp and contains elongate 

outcrops of relatively younger plains materials. Interpretation: 

Lava plains heavily deformed by corona contraction and extension

Older Feronia Corona material—Very high backscatter to high 

backscatter material that makes up bulk of Feronia Corona. Defined 

by dense systems of ridges and lineaments, some of which contain 

narrow outcrops of low-backscatter material. Grades in places with 

adjacent, younger Feronia Corona material (unit cF2). Interpretation: Lava plains heavily deformed by corona contraction and 

extension

TESSERA MATERIAL

Densely lineated materials with irregular margins that make up regional tesserae. 

Due to structural complexity as the defining nature of tesserae, symbols depicted 

within the boundaries of the unit are intended to convey only local type and trend of 

tectonic structures

Tessera material—Very high to high-backscatter material that forms 

relatively higher standing Virilus and Atropos Tesserae and Okipeta 

Dorsa, as well as densely lineated material in Libuše Planitia. 

Contains complexly intersecting structures with multiple orientations, including ridges and fractures. Forms topographic warps in 

Atropos Tessera. Margins irregularly shaped. Interpretation: 

Highly deformed materials that represent multiple phases of extension and contraction centered at contrasting locations. Irregular 

shape implicates significant embayment by younger plains materials. May grade in places with plains unit 1 (unit p1)

CRATER MATERIALS

Crater material—High- to moderate-backscatter material discretely 

associated with crater rims, blankets, and floors (see table 3). Can 

surround low-backscatter material. Texture hummocky to granular. 

Superposes multiple plains units throughout the map region. Interpretation: Crater rim, ejecta deposits, and floor deposits formed by 

surface impact. Morphology may represent local deformation 

related to relaxation of crater rim. May include crater flow material

Crater flow material—High- to low-backscatter material associated 

with some impact craters. Contains lobate margins and digitate 

terminations with narrow, anatamosing surfaces. Locally speckled 

at kilometer to subkilometer scales. Interpretation: Flows of 

fluidized impact melt

EXPLANATION OF MAP SYMBOLS

Contact—Dashed where character is uncertain or where approximately 

located

Wrinkle ridge crest

Lineament—Interpreted as narrow graben or fracture

Ridge and fracture belt (width >15 km wide)

Topographic warp

Volcanic edifice (diameter >5 km)

Volcanic edifice (diameter <5 km)

Flow direction

Channel-form

Scarp—Barbs point downslope

Impact crater—Rim diameter >15 km

Impact crater—Rim diameter <15 km

240° 75°

250° 260° 270° 280° 290°

300°

70°

65°

60°

55°

50°

Figure 1. Context figures of the entire Metis Mons (V–6) quadrangle (lat 50° to 75° N., long 

240o to 300o E.), Venus. North is to the top. Projection is in Lambert Conformal Conic with a 

planetary radius of 3025.5 km. A, Magellan synthetic aperture radar (SAR) mosaic showing the 

relative intensity of 12.6-cm-wavelength radar backscatter. Mosaic is superposed with geologic 

contacts in yellow, which have been grouped into material suites for maximum clarity. 

Generally, tessera, densely lineated plains, craters, and some of the younger flow fields make up 

the brightest surfaces (highest relative backscatter). Darkest surfaces are associated with 

lowland plains materials, particularly where they are overlain by dark parabolic haloes or 

associated with Cotton, Montessori, and Hayashi craters, which dominate the central, northeastern, and southwestern areas of the quadrangle. Small, dark splotches surround Golubkina, 

Indira, and Olya craters. Crater locations and characteristics are summarized in table 3. B, Unit 

groupings, as delineated in the Correlation of Map Units, and major physiographic features 

within the Metis Mons quadrangle (see map for all approved nomenclature located within V–6). 

Large impact craters are denoted with black arrows.

240° 75°

250° 260° 270° 280° 290°

300°

70°

65°

60°

55°

50°

240° 75°

250° 260° 270° 280° 290°

300°

70°

65°

60°

55°

50°

Figure 5. Magellan reflectivity and contacts of map-unit groupings (black lines) of the Metis Mons 

quadrangle (V–6), Venus. Low reflectivity areas include some of the tesserae and coronae outcrops. 

Plains areas and large volcanoes dominated by higher reflectivity.

240° 75°

250° 260° 270° 280° 290°

300°

70°

65°

60°

55°

50°

Figure 2. Magellan altimetry and contacts of map-unit groupings (black lines) of the Metis Mons 

quadrangle (V–6), Venus. Large volcanic shields, tesserae, and some densely lineated areas make up 

pronounced topographic highs, whereas ridge and fracture belts and corona annuli and cores make up 

most moderate high areas. Lowland plains make up much of southeastern quadrant and southwestern 

corner of map region. See table 4 for summary of unit elevation.

240° 75°

250° 260° 270° 280° 290°

300°

70°

65°

60°

55°

50°

Figure 3. Magellan root-mean-square (rms) slope and contacts of map-unit groupings (black lines) of the 

Metis Mons quadrangle (V–6), Venus. The rms slope relates to meter-scale roughness. Rougher materials 

include coronae and tessera materials, as well as some mons materials. Most homogeneous and 

moderately lineated plains have moderate to low rms slope. Note smooth halo and tail of low rms slope 

extending west of Montessori crater. See table 4 for summary of unit rms slope.

240° 75°

250° 260° 270° 280° 290°

300°

70°

65°

60°

55°

50°

Figure 4. Magellan emissivity and contacts of map-unit groupings (black lines) of the Metis Mons 

quadrangle (V–6), Venus. In general, higher values represent rough surfaces and (or) low dielectric 

content materials. High emissivity ranges occur in coronae and tesserae materials and low ranges are 

largely confined to plains materials. There is not a clear association of emissivity with any of the mapped 

craters. See table 4 for summary of unit emissivity.

Plains

materials

Mons

materials

Corona

materials

Tessera

materials

Crater

materials

–3 –2 –1 0 1 2 3 4 5 KILOMETERS

Altimetry Root-mean-square slope (degrees) Microwave emissivity Corrected reflectivity

0.6 0.7 0.8 0.9 1.0

A B

75°

50°

25°

75°

25°

–25°

0°

50°

0°

180° 210° 240° 270° 300° 330° 360°

–25°

–50° –50°

–75° –75°

V–1

V–29 V–30 V–28

V–40

V–62

V–41

V–27

V–26

V–15

V–14

V–16

V–39 V–42

V–18

V–51 V–54

V–17

V–52 V–53

V–60

V–6

V–5

V–19

V–50 V–55

V–31

V–38 V–43

V–7

V–59 V–61

QUADRANGLE LOCATION

Photomosaic showing location of map area. An outline of 

1:5,000,000-scale quadrangles is provided for reference.

Any use of trade, product, or firm names in this publication is for descriptive purposes only 

and does not imply endorsement by the U.S. Government

For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, 

Denver, CO 80225, 1–888–ASK–USGS

Digital files available at http://pubs.usgs.gov/sim/3158/

Suggested citation: Dohm, J.M., Tanaka, K.L., and Skinner, J.A., 2011, Geologic map of the 

Metis Mons quadrangle (V–6), Venus: U.S. Geological Survey Scientific Investigations 

Map 3158, scale 1:5,000,000 [http://pubs.usgs.gov/sim/3158/].

CORRELATION OF MAP UNITS

Prepared on behalf of the Planetary Geology and Geophysics Program, 

Solar System Exploration Division, Office of Space Science, National 

Aeronautics and Space Administration

Edited by J.L. Zigler; cartography by Darlene A. Ryan

Manuscript approved for publication March 6, 2011

Prepared for the

National Aeronautics and Space Administration

Scientific Investigations Map 3158

Atlas of Venus: Metis Mons Quadrangle (V–6)

Pamphlet accompanies map

Geologic Map of the Metis Mons Quadrangle (V–6), Venus

By

James M. Dohm1, Kenneth L. Tanaka2, and James A. Skinner2

2011

1

Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ

2

U.S. Geological Survey, Flagstaff, AZ

Descriptions of nomenclature used on map are listed at 

http://planetarynames.wr.usgs.gov/

Printed on recycled paper

U.S. Department of the Interior

U.S. Geological Survey