OU PH 13447 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13447Add new comment
OU PH 13451 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13451Add new comment
OU PH 13455 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13455Add new comment
OU PH 13458 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13458Add new comment
OU PH 13457 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13457Add new comment
OU PH 13460 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13460Add new comment
OU PH 13461 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13461Add new comment
OU PH 13462 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13462Add new comment
OU PH 13463 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13463Add new comment
OU PH 13465 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13465Add new comment
OU PH 13439 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13439Add new comment
OU PH 13440 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13440Add new comment
OU PH 13444 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13444Add new comment
OU PH 13446 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13446Add new comment
OU PH 13457 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13457Add new comment
OU PH 13438 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13438Add new comment
OU PH 13437 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13437Add new comment
OU PH 13425 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13425Add new comment
OU PH 13424 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13424Add new comment
OU PH 13429 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13429Add new comment
OU PH 13427 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13427Add new comment
OU PH 13426 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13426 Add new comment
OU PH 13411 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13411 Add new comment
OU PH 13450 Stratigraphy: Terrestrial black shale between the Mahoning coal and the Brush Creek marine silty unit Read more about OU PH 13450 Add new comment