31:
132:
202:
The
Wianamatta Group has been inferred to represent a cycle of basin infilling associated with the migration of a large delta front from west to east. The Ashfield Shale was deposited in a low energy marine environment and preserves laminated silty sediments. The Minchinbury Sandstone comprises a set
159:, which clearly show the transition from marine deposits in front of the delta to deposits on land: Ashfield shale was formed from clayey marine sediments. The subsequent Minchinbury Sandstone emerged from beach - Nehrungs Islands. The Bringelly shale became
222:
Low-lying areas where groundwater is close to the surface are also susceptible to dryland salinity. Groundwater quality can range from fresh to highly saline, with the deeper groundwater generally less saline.
190:; however, if they are at or near the surface, salted dry land may form as the water evaporates. The quality of the groundwater over the pitches can be good, so that drinkable water occurs, or it can be very
203:
of sandy barrier islands at the former shoreline. The
Bringelly Shale was deposited in a swampy alluvial plain with meandering streams flowing from the west forming discontinuous beds of sandstone.
163:
in a marshy plain deposited on the delta, meandered through the rivers, and deposited sand at various locations, each of which was narrowly defined, which later solidified into sandstone.
179:
produces abundant clay, which leads to the formation of clay soils with low water permeability, as they occur, for example, on the
Cumberland Plain widespread. Here are
194:
and thus not potable. The lower groundwater resources in the
Wianamatta Group rocks are generally less saline than the near-surface occurrences.
186:
Over the pitches of the
Wianamatta Group, water-bearing layers can form. Deep and large clay deposits of this formation are able to collect
343:
321:
293:
120:
41:
151:, and therefore lies at the highest point as the highest layer member. It was deposited in connection with a large
45:
140:
235:
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Weathering of the shale units produces a rich clayey soil, often with poor drainage, such as that in the
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108:
231:
30:
255:
317:
289:
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123:. It was officially established in 1952, fully attested in 1954 and further amended in 1979.
212:
136:
76:
72:
227:
131:
103:
64:
99:
The
Wianamatta Group is made up of the following units (listed in stratigraphic order):
113:
36:
337:
148:
60:
155:, which shifted over time from west to east. This is evidenced by the sequence of
187:
152:
17:
172:
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floors widespread that swell when supplying water and shrink during drying.
176:
88:
68:
49:
288:(1 ed.). Maitland: Geological Survey of New South Wales. p. 582.
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84:
215:. These clay soils are recognised as being reactive with appreciable
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156:
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The
Wianamatta Group is the youngest geological layer member of the
314:
Native Plants of the Sydney
District : An Identification Guide
130:
80:
29:
119:
The
Wianamatta Group was derived from the Aboriginal name for
71:
that directly overlies the older (but still
Triassic in age)
316:(2nd ed.). Kenthurst, NSW: Kangaroo Press. p. 19.
226:
Other rock types found in the Sydney Basin include the
238:, Newcastle Coal Measures, and Shoalhaven Group.
8:
307:
305:
279:
277:
247:
284:Herbert, Chris; Helby, Robin (1980).
7:
75:and generally comprise fine grained
25:
40:of the Wianamatta group, by the
175:of the surface of the existing
59:is a geological feature of the
27:Geologic formation in Australia
1:
312:Fairley A, Moore P (2000).
286:A Guide to the Sydney basin
360:
344:Geology of New South Wales
198:Depositional environment
262:. Australian Government
236:Illawarra Coal Measures
87:as well as less common
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52:
260:Geo Science Australia
217:Shrink-swell capacity
135:Exposed sediments on
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109:Minchinbury Sandstone
33:
73:Hawkesbury sandstone
232:Mittagong formation
256:"Wianamatta Group"
145:
53:
77:sedimentary rocks
16:(Redirected from
351:
328:
327:
309:
300:
299:
281:
272:
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269:
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213:Cumberland Plain
137:Prospect Highway
57:Wianamatta Group
21:
18:Wianamatta Shale
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228:Narrabeen shale
209:
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129:
104:Bringelly Shale
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65:New South Wales
42:Pacific Highway
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23:
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114:Ashfield Shale
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37:Ashfield Shale
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2:
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323:0-7318-1031-7
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295:0-7240-1250-8
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266:November 13,
264:. Retrieved
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149:Sydney Basin
146:
118:
98:
61:Sydney Basin
56:
54:
35:
188:groundwater
153:river delta
121:South Creek
242:References
207:Weathering
173:weathering
167:Weathering
177:claystone
89:sandstone
85:laminites
69:Australia
50:Australia
46:Chatswood
338:Category
171:Today's
161:alluvial
141:Pemulwuy
79:such as
34:Exposed
127:Geology
91:units.
320:
292:
192:saline
181:Podsol
157:strata
81:shales
95:Group
318:ISBN
290:ISBN
268:2020
83:and
55:The
340::
304:^
276:^
258:.
234:,
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67:,
63:,
48:,
44:,
326:.
298:.
270:.
143:.
20:)
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