Table 1 Lithological description of the CX profile.

From: Record of polycyclic aromatic hydrocarbons (PAHs) from prehistoric sediments and human activity in the Lubei plain of China

Depth (cm)

Lithology

Stratigraphic description

0-70

Topsoil

Clumpy granular structure; a few fragments of peach pits were observed at 50 cm depth, and grey pottery shards were found between 40–50 cm depth

70-130

Coarse silt

Coarse silt, yellowish orange, the massive structure

130-155

Soil

Clayey silt, dark brownish yellow, granular structure, strong pedogenesis, many root pores and earthworm wormholes.

155-205

Clayey silty

Silty sand with a clayey texture, granular and cloddy structure, orange-yellow in color, containing a small number of wormholes and root holes.

205-206

Flooding sediments

Silt, orange, uniform and loose texture, no stratification, flood sediments.

206-220

Clayey silty

Clayey silty sand with a granular and cloddy structure.

220-235

Flooding sediments

Fine silty sand, uniform in texture, orange-yellow in color.

235-250

Clayey silty

Clayey silty sand with a granular and cloddy structure, containing a large amount of earthworm castings.

250-275

Soil

Cloddy and relatively loose.

275-290

Coarse silt

Coarse silt, yellowish orange, the massive structure

290-340

Paleosoil

Loose texture with abundant iron rust spots, relatively uniform, containing a few charcoal-colored spots; indistinct layering of mud and sand.