Seitenhistorie

h5. Fluvial sand, Wouri River, Cameroon

| !cameroon_river_macro_1100.jpg|thumbnail,align=left! | | !0143_makro_1200.jpg|thumbnail,align=right! |
| Glass bead is 200µ in diameter \\
{table-cell:width=30%}
{table-cell} | _replace this with the caption to image above_ |

| *Location* \\ | Shore of the Wouri river (25 km from the Atlantic ocean), City of Douala (long. 9 42'; Lat. 4 3'), Cameroon |
| *Depositional facies* \\ | River shore |
| *Provenance* \\ | Mix of (1) ?volcanic source rich in quartz with (2) ?basaltic gas-rich lava; also, (3) some arid-climate components |
| *Composition* \\ | Dominant typically blocky, highly angular transparent and clear, occasionally slightly yellowish quartz (volcanic or high-grade metamorphic  provenance ?). Significant (~5%) component of fresh black glassy bubbly lava (resembling pumice), few wind-abraded grains with desert varnish; very few grains of chlorite/epidote minerals. Interesting incongruent composition. Traces of well rounded quartz grains and recent plant seeds |
| *Texture* | Coarse-grained (cU, median ca. 1000µ); poorly sorted, angular |
h6. Petrographic thin section:
| *Description* | _insert here short description of thin section_ |

| _insert here a bright field image_ |  | _insert here a dark field image_ |
| Bright field {table-cell:width=30%}
{table-cell}| Dark field  |



| *Sample number* | _replace this with sample number_ |
| *Collector* | _replace this with name and institution of collector_ | 
| *Date of sampling* | _replace this with date of sampling_ |




h6. Comments:

_replace this text with further comments about the sand ecc._

[Additional data page|geowisssand:0141 Additional data]