# 124_Kennedy_Seagull_legend

GENL_DESC:
stream-deposited gravel, sand and silt, commonly overlain by, or grading
laterally into, lacustrine and overbank silt and sand or organic sediments. Found along
contemporary streams with meandering planforms. Gravel is typically rounded and contains
interstitial sand. Alluvial deposits in Seagull Creek valley are moderately to well sorted and are
commonly stratified with organic deposits.

DESCRIPTION:
extensive on the nearly horizontal (relief of < 1 m) floodplain surface,
alluvial plains consist predominantly of fine-grained sand and silt interbedded with
gravel and/or organic materials. Floodplain sediments accrete vertically through
organic and overbank deposition.


DESCRIPTION:
stepped or benched landforms occurring approximately 2 - 10 m above the edge of the Seagull Creek floodplain. Consist of gravel, sand, silt and locally cobbles. Terraces occurring at higher elevations are likely the result of paraglacial readjustments to stream base level immediately following the end of the last glaciation. These terraces generally contain coarser sediments (cobbles and boulders).


DESCRIPTION:
shallow-sloped (<15 degrees) conic sector, that descends from an apex to a semi-circular margin. These constructional landforms are built at the mouth of tributary valleys, ravines, or gullies and can be used to characterize the mineralogy of their drainage basins. Typically range from well sorted fine sand and silt to coarse
sand, gravel and cobble diamicts; limited to the break in slope separating the valley side from the valley floor of Seagull Creek and some larger tributary valleys.


DESCRIPTION:
ridges, pits, terraces, and channels with relief generally ranging between 0.5 m to > 2 m. Complexes are formed by undifferentiated plains, terraces, fans, and other non-alluvial materials.


GENL_DESC:
accumulations of vegetal materials consisting primarily of peat, with minor amounts of mineral sediments such as sand, silt, and clay. These deposits are found in areas of poor drainage or high water table conditions such as lower Seagull Creek, and north-facing slopes impervious to drainage because of underlying permafrost.


GENL_DESC:
tongues or apron like accumulations of rock debris that display morphological features (such as steep-faced lobate snouts and morainal ridges) suggesting present or past, downslope movement. Active rock glaciers contain ice, either as a core or as a matrix between clasts.

DESCRIPTION:
small, mostly inactive rock glaciers occurring in north-facing cirques.


GENL_DESC:
diamicton, gravel, shattered bedrock, and lenses of silt and sand derived from bedrock and surficial materials by a variety of physical and chemical weathering processes and transported downslope by gravity. Transport processes range from fast moving rockfalls and debris flows to slow soil creep and solifluction. On the steep slopes of the Seagull Creek valley colluvium generally occurs as a veneer at high elevations and thickens toward the valley bottom. Solifluction processes are an important means of transportation on all slopes, but are particularly
effective on north-facing slopes affected by permafrost processes.

DESCRIPTION:
thin (< 1 m) discontinuous veneer of angular rock fragments and coarse sand commonly overlying bedrock at higher elevations. Colluvium is predominantly locally derived from shattered or weathered bedrock. At lower elevations colluvium can become intercalated with till, alluvial fans, glaciofluvial or glaciolacustrine sediments.


DESCRIPTION:
shallow -sloped (<15degrees) conic sector, descending from an apex to a semi-circular margin. Colluvial fans are generally built at the mouths of tributary ravines, gullies, or chutes in high elevation areas of the map area and contain poorly sorted angular fragments of rock and other hillslope materials.


DESCRIPTION:
angular, poorly sorted rock and rock fragments accumulating (>1 m thick) at the base of steep slopes, commonly as a series of coalesced fans. Generally found in alpine cirques and tributary valleys to Seagull Creek.


DESCRIPTION:
continuous or nearly continuous mantle of colluvium > 1 m thick. Colluvial blankets generally consist of a more diverse range of particle sizes than colluvial veneers. In the Seagull Creek valley, colluvial blankets occur on the lowest slopes and commonly contain permafrost on north-facing slopes.


DESCRIPTION:
includes rotational slumping, debris slides and rock avalanches (see symbols).


AGE:
Late Pleistocene (Wisconsinan) - McConnell Glaciation

GENL_DESC:
stratified to massive; poorly to well sorted; gravel with minor silt, sand and cobbles laid down by running water on top of, beneath, against, and beyond glaciers (glacial meltwater). Glaciofluvial deposits in the map area are concentrated in valley bottoms, and at the mouths of tributary streams of the Seagull and Tolbert Creek valleys. Deposits on the valley floor are commonly overlain with alluvial or glaciolacustrine sediments, and are present at the surface only on fluvial terraces and the lower slopes of the valley side.

DESCRIPTION:
0-30 m thick, hummocky topography associated with ice-contact glaciofluvial terraces, plains, crevasse fillings, eskers and related glaciolacustrine and morainal materials. Sand and gravel usually display moderate rounding, moderate to very poor sorting, and textures can change rapidly over small lateral or vertical distances.


DESCRIPTION:
ice marginal terrace, commonly with an irregular upper surface pitted with kettles and meltwater channels (see symbols). Stratification and sorting are generally poor, but can increase away from the former ice-margin. Similarly, boulders may be found near ice-contact surfaces or at depth within the landform, but clasts generally decrease in size away from the ice front (in the case of Seagull Creek, this is up-valley toward Seagull Lakes).


GENL_DESC:
well-stratified sand, silt and minor clay deposited in lakes impounded by glacial ice or sediment; may have a smooth or kettled surface pattern due to melting of buried ice. Poorly drained areas are commonly overlain by organic material and can be subject to thermokarst processes. Much of the alluvial plain in lower Seagull Valley may be underlain by glaciolacustrine deposits of significant thickness.

DESCRIPTION:
1 - > 3 m thick, blankets generally subdue underlying topography and have horizontal, planar surfaces.


DESCRIPTION:
< 1 m thick, veneers conform to underlying topography and are usually evident in the Seagull Creek valley by a thin drape of laminated fine silt, sand, and clay on valley sides and bottom.


GENL_DESC:
unsorted clay, silt, sand pebbles and cobbles with minor boulders; deposited by or from glacial ice and occuring as subdued veneer and blanket deposits. Occurs on the surface of valley sides in the Seagull Creek valley but is largely buried by glaciofluvial and glaciolacustrine sediments in the valley bottom.

DESCRIPTION:
< 1 m thick, conforms to underlying topography.


DESCRIPTION:
> 1 m thick, gently to moderately sloping plain controlled by bedrock or underlying surficial deposits.


DESCRIPTION:
till blanket or veneer composed of meltout till and minor ice contact glaciofluvial deposits.


GENL_DESC:
The Seagull Creek map area is located within the Pelly-Cassiar Platform, a region of northwest trending platform carbonates deposited at the western margin of North America between the late Precambrian and Triassic (Gordey and Makepeace, 1999). Mid-Cretaceous granitic rocks extensively intrude the assemblage, and Tertiary right-lateral movement of 450 km along the Tintina Fault (located approximately 35 km to the northeast) has displaced these rocks relative to ancestral North America (Murphy and Mortensen, 2003). Epigenetic occurrences of gold and silver occur within the map sheet (see MINFILE occurrences). The mineralization has been related to a domal uplift, termed the Ketza-Seagull Arch (Abbott, 1986). Vein deposits are found in pods and lenses along well-defined faults with small apparent displacements. On the Tay-LP gold-copper property at Seagull Creek, garnet-diopside skarn rocks are found in close association with limestone and intrusions of quartz monzonite (Tolbert, 2000).

DESCRIPTION:
primarily prominent ridges, escarpments, and mountain summits.


# 124_surficial_lines_conversions

TYPE:
meltwater channel, minor, flow direction known

OLD_TYPE:
small glacial meltwater channel, lateral/sidehill


TYPE:
streamlined landform, ice-flow direction unknown

OLD_TYPE:
streamlined glacial landform, ice flow direction unknown


# 124_surficial_points_conversions

TYPE:
meltwater channel, minor, flow direction known


TYPE:
streamlined landform, ice-flow direction unknown


# stratigraphic_sections

Descriptn1:
near horizontal, massively bedded medium and fine sand
grading to silt. Increasingly pebble-dominated toward top
of unit


Descriptn1:
poorly sorted pebble-cobble gravel with irregular coarse sand beds dipping 12 degrees north. Minor beds of fine sand, silt, and diamict


Descriptn1:
coarse to fine sand with clay- and sand-rich beds


Descriptn1:
emplaced gravel with minor diamict lenses, imbricated pebbles dip south at 14-16 degrees


Descriptn1:
medium to fine bedded sand grading to pebble cobble gravel at lower, erosional contact


Descriptn1:
coarsely bedded gravel and fine sand with minor diamict lenses


Descriptn1:
massive coarse sandy gravel grading to medium - fine sand


Descriptn1:
clast dominated (70% pebble cobble gravel) diamict with 30% silty coarse sand matrix; 12 ppb Au at 12 m


Descriptn1:
poorly sorted diamict of silt, sand, pebbles and few cobbles


Descriptn1:
tan coloured friable clay with laminations (2- 10 cm thick)


Descriptn1:
tan coloured massive to weakly bedded fine sand; 5.2 ppb Au at 1.2 m


Descriptn1:
clast dominated (60% angular pebble cobble gravel) diamict with 40% silty coarse sand matrix; rusty brown in colour; 33.5 ppb Au at 0.65 m and 14.4 ppb Au at 0.9 m.


# surficial_lines

ORIGNL_MAP:
Kennedy, 2005, Seagull Creek (105F/10&7), YGS Open File 2005-1


TYPE:
meltwater channel, minor, flow direction known

OLD_TYPE:
small glacial meltwater channel, lateral/sidehill


TYPE:
streamlined landform, ice-flow direction unknown

OLD_TYPE:
streamlined glacial landform, ice flow direction unknown


# surficial_points

ORIGNL_MAP:
Kennedy, 2005, Seagull Creek (105F/10&7), YGS Open File 2005-1


TYPE:
streamlined landform, ice-flow direction unknown


# surficial_polygons

ORIGNL_MAP:
Kennedy, 2005, Seagull Creek (105F/10&7), YGS Open File 2005-1


