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Austin Chalk Formation, TX

Figures | References | Summary Table

Brachiopods

Terebratulina guadalupe

Austin Chalk (Kau)
Travis County | T3-688

Terebratulina guadalupe - None

Echinoderms

Hemiaster Texanus

Austin Chalk (Kau)
Travis County | W1-511

Hemiaster Texanus - None

Enchinoid

Austin Chalk (Kau)
Williamson County | W1-724

Enchinoid - None

Mollusks

Anchura Texana

Austin Chalk (Kau)
Williamson County | W1-697

Anchura Texana - None

Gastropod

Austin Chalk (Kau)
Williamson County | W1-672

Gastropod - None

Gastropod

Austin Chalk (Kau)
Williamson County | W1-681

Gastropod - None

Gastropod

Austin Chalk (Kau)
Williamson County | W1-716

Gastropod - None

Gastropod

Austin Chalk (Kau)
Williamson County | W1-717

Gastropod - None

Gastropod

Austin Chalk (Kau)
Williamson County | 575

Gastropod - None

Silicified Turritella

Austin Chalk (Kau)
Williamson County | W1-641

Silicified Turritella - None

Baculites sp.

Austin Chalk (Kau)
Travis County | 15

Baculites sp. - Gilleland Creek

Baculites sp.

Austin Chalk (Kau)
Williamson County | W1-488

Baculites sp. - Round Rock, TX

Baculites sp.

Austin Chalk (Kau)
Travis County | T3-122

Baculites sp. - Pflugerville

Baculites sp.

Austin Chalk (Kau)
Williamson County | W1-492

Baculites sp. - Round Rock, TX

Glyptoxoceras sp.

Austin Chalk (Kau)
Travis County | T3-123

Glyptoxoceras sp. - Pflugerville

Smedaliceras durhami

Austin Chalk (Kau)
Travis County | 18

Smedaliceras durhami - Little Walnut Creek

Texanites Sp.

Austin Chalk (Kau)
Travis County | 60

Texanites Sp. - Gilleland Creek

Inoceramus

Austin Chalk (Kau)
Williamson County | W1-490

Inoceramus - Round Rock, TX

Inoceramus Vinson?

Austin Chalk (Kau)
Williamson County | 264

Inoceramus Vinson? - Austin

Inoceramus sp

Austin Chalk (Kau)
Travis County | 7

Inoceramus sp - Austin

Platyceramus

Austin Chalk (Kau)
Williamson County | 116

Platyceramus - Hutto

Spondylus guadalupae

Austin Chalk (Kau)
Williamson County | W1-718

Spondylus guadalupae - None

Spondylus guadalupae

Austin Chalk (Kau)
Travis County | 331

Spondylus guadalupae - Gilleland Creek

Neithea sp.

Austin Chalk (Kau)
Williamson County | W1-491

Neithea sp. - Round Rock, TX

Neithea?

Austin Chalk (Kau)
Travis County | T3-333

Neithea? - Pflugerville

Bivalve

Austin Chalk (Kau)
Williamson County | W1-725

Bivalve - None

Bivalve Sp.

Austin Chalk (Kau)
Williamson County | W1-674

Bivalve Sp. - None

Bivalve?

Austin Chalk (Kau)
Williamson County | W1-671

Bivalve? - None

Bivalve?

Austin Chalk (Kau)
Williamson County | W1-684

Bivalve? - None

Bivalve Sp.

Austin Chalk (Kau)
Williamson County | W1-670

Bivalve Sp. - None

Cucullaea Sp.

Austin Chalk (Kau)
Williamson County | W1-687

Cucullaea Sp. - None

Idonearca?

Austin Chalk (Kau)
Williamson County | W1-673

Idonearca? - None

Bivalve Sp.

Austin Chalk (Kau)
Williamson County | W1-675

Bivalve Sp. - None

Liopistha elegantuia?

Austin Chalk (Kau)
Williamson County | W1-495

Liopistha elegantuia? - Round Rock, TX

Exogyra Ponderosa

Austin Chalk (Kau)
Travis County | T3-2

Exogyra Ponderosa - Pflugerville

Exogyra laeviuscula

Austin Chalk (Kau)
Travis County | 75

Exogyra laeviuscula - Travis County

Exogyra tigrina

Austin Chalk (Kau)
Travis County | 36

Exogyra tigrina - Little Walnut Creek

Gryphaea Sp.

Austin Chalk (Kau)
Williamson County | W1-683

Gryphaea Sp. - None

Gryphaea aucella

Austin Chalk (Kau)
Williamson County | 3

Gryphaea aucella - Hutto

Small Oyster

Austin Chalk (Kau)
Williamson County | W1-682

Small Oyster - None

Ostrea sp.

Austin Chalk (Kau)
Travis County | 585

Ostrea sp. - None

Oyster Sp.

Austin Chalk (Kau)
Williamson County | W1-676

Oyster Sp. - None

Oyster Sp.

Austin Chalk (Kau)
Williamson County | W1-493

Oyster Sp. - Round Rock, TX

Oyster Sp.

Austin Chalk (Kau)
Williamson County | W1-494

Oyster Sp. - Round Rock, TX

Oyster?

Austin Chalk (Kau)
Williamson County | W1-677

Oyster? - None

Phrygia lumachelle

Austin Chalk (Kau)
Travis County | 267

Phrygia lumachelle - Austin

Trace

Burrow Atco Member

Austin Chalk (Kau)
Williamson County | 385

Burrow Atco Member - Round Rock

Boring Sponge

Austin Chalk (Kau)
Williamson County | 582

Boring Sponge - None

Geology

Atco

Austin Chalk (Kau)
Williamson County | 388

Atco - Round Rock

Atco Member

Austin Chalk (Kau)
Williamson County | 258

Atco Member - Brushy Creek

Atco Member

Austin Chalk (Kau)
Williamson County | 259

Atco Member - Brushy Creek

Atco Member

Austin Chalk (Kau)
Williamson County | 260

Atco Member - Brushy Creek

Atco Member

Austin Chalk (Kau)
Williamson County | 386

Atco Member - Round Rock

Austin Chalk

Austin Chalk (Kau)
Bexar County | 503

Austin Chalk - San Antonio, TX

Burdett Marl

Austin Chalk (Kau)
Travis County | 254

Burdett Marl - Little Walnut Creek

Dessau Member

Austin Chalk (Kau)
Travis County | 261

Dessau Member - Pflugerville

Dessau Member?

Austin Chalk (Kau)
Travis County | 268

Dessau Member? - Austin

Dessau Member?

Austin Chalk (Kau)
Williamson County | 270

Dessau Member? - Brushy Creek

Dessau Member?

Austin Chalk (Kau)
Williamson County | 271

Dessau Member? - Brushy Creek

Dessau Storm Bed?

Austin Chalk (Kau)
Williamson County | 269

Dessau Storm Bed? - Brushy Creek

Gober Chalk

Austin Chalk (Kau)
Fannin County | 405

Gober Chalk - Gober, TX

Grainstone

Austin Chalk (Kau)
Travis County | 244

Grainstone - McKinney Falls

Grainstone

Austin Chalk (Kau)
Travis County | 245

Grainstone - McKinney Falls

Grainstone

Austin Chalk (Kau)
Williamson County | 248

Grainstone - Jonah, TX

Jonah Outcrop

Austin Chalk (Kau)
Williamson County | W1-678

Jonah Outcrop - None

Jonah Outcrop

Austin Chalk (Kau)
Williamson County | W1-679

Jonah Outcrop - None

Jonah Outcrop

Austin Chalk (Kau)
Williamson County | W1-680

Jonah Outcrop - None

Marl Seam

Austin Chalk (Kau)
Travis County | 251

Marl Seam - Gilleland Creek

Marl Seam

Austin Chalk (Kau)
Travis County | 252

Marl Seam - Gilleland Creek

Packstone/Grainstone

Austin Chalk (Kau)
Williamson County | 247

Packstone/Grainstone - Jonah, TX

Packstone/Grainstone

Austin Chalk (Kau)
Williamson County | 249

Packstone/Grainstone - Jonah, TX

Packstone/Grainstone?

Austin Chalk (Kau)
Travis County | 253

Packstone/Grainstone? - Gilleland Creek

Phrygia lumachelle zone?

Austin Chalk (Kau)
Travis County | 256

Phrygia lumachelle zone? - Gilleland Creek

Vinson Member?

Austin Chalk (Kau)
Travis County | 263

Vinson Member? - Austin

Vinson Member?

Austin Chalk (Kau)
Travis County | 265

Vinson Member? - Austin

Vinson Member?

Austin Chalk (Kau)
Travis County | 266

Vinson Member? - Austin

Calcite Slickenside

Austin Chalk (Kau)
Travis County | 8

Calcite Slickenside - Gilleland Creek

Calcite Slickenside

Austin Chalk (Kau)
Fannin County | 404

Calcite Slickenside - Gober, TX

Marcasite Nodule

Austin Chalk (Kau)
Travis County | 154

Marcasite Nodule - Austin

Pyrite on Inoceramus

Austin Chalk (Kau)
Travis County | 89

Pyrite on Inoceramus - Little Walnut Creek

Limonite

Austin Chalk (Kau)
Travis County | 255

Limonite - Little Walnut Creek

Limonite Nodule

Austin Chalk (Kau)
Travis County | 147

Limonite Nodule - Travis County

Limonite after Pyrite

Austin Chalk (Kau)
Bexar County | 500

Limonite after Pyrite - San Antonio, TX

Limonite after Pyrite

Austin Chalk (Kau)
Bexar County | 501

Limonite after Pyrite - San Antonio, TX

Beekite

Austin Chalk (Kau)
Williamson County | W1-579

Beekite - None

Beekite on Shell

Austin Chalk (Kau)
Williamson County | W1-578

Beekite on Shell - None

Interbedded Tuff and Limestone

Austin Chalk (Kau)
Travis County | 568

Interbedded Tuff and Limestone - y

Pilot Knob Tuff

Austin Chalk (Kau)
Travis County | 566

Pilot Knob Tuff - y

Pilot Knob Tuff

Austin Chalk (Kau)
Travis County | 567

Pilot Knob Tuff - y

Volcanic Ash/Nontronite

Austin Chalk (Kau)
Travis County | 241

Volcanic Ash/Nontronite - McKinney Falls

Volcanic Ash/Nontronite

Austin Chalk (Kau)
Travis County | 242

Volcanic Ash/Nontronite - McKinney Falls

Volcanic Ash/Nontronite

Austin Chalk (Kau)
Travis County | 243

Volcanic Ash/Nontronite - McKinney Falls

Fault w/ Slickensides

Austin Chalk (Kau)
Travis County | 250

Fault w/ Slickensides - Gilleland Creek

Fault?

Austin Chalk (Kau)
Bexar County | 502

Fault? - San Antonio, TX

Liesegang rings

Austin Chalk (Kau)
Bexar County | 499

Liesegang rings - San Antonio, TX

Figures

Map Late Cretaceous
Map Late Cretaceous

References

Guidebook to the Geology of Travis County

Summary Table