erosion, it rises 34 metres (112 ft) above the naturally flat landscape. [15]  Buried deep within La Venta, lay opulent, labor-intensive "offerings" – 1000 tons of smooth  serpentine  blocks, large mosaic pavements, and at least 48 separate  deposits  of polished jade  celts , pottery, figurines, and  hematite  mirrors. [16] [ edit ] Decline