Archaeological palimpsests are depositional units where the remains of various human occupations have been mixed for hundreds to hundreds of thousands of years. They create various sets of analytical scales that archaeologists must deal with routinely. In this paper, I argue that sociocultural processes derived from a communities of practice framework — scaffolding, guided participation, and continuity through shared activities — can be used by archaeologists to describe a palimpsest’s lithic assemblage, to differentiate its patterns, and to interpret their meaning. These processes must first be remapped onto an ecological approach to skill before they can be expanded onto new sets of scales, however. I ground my work at the site of La Martre (Quebec, Canada), a nexus of fifteen marine terraces spread over 500,000 m². Slow depositional processes and plowing have mixed its lithic remains to create a 10,000-year-wide depositional unit with poor chronological and spatial control. Fieldwork conducted between 1995 and 1999 sampled 0.03% of its total surface. Most of its 2111 tools and 207,506 flakes were uncovered in its 40-cm-thick plowzone. I build methodological tools — dispersion surfaces, skill combinatorics, and extended skilled reduction sequences — to describe a small subset (N=93) from one of La Martre’s loci (16-west). I describe ten extended skilled reduction sequences showing various degrees of skill and knapping methods. Concepts of scaffolding, guided participation and continuity through shared activities are then used to interpret these patterns.

考古重写本是沉积单位，其中各种人类职业的遗迹已经混合了数百至数十万年。他们创建了考古学家必须经常处理的各种分析尺度。在本文中，我认为源自实践社区框架的社会文化过程——脚手架、引导参与和通过共享活动的连续性——可以被考古学家用来描述重写本的石器组合，区分其模式，并解释其含义。然而，这些过程必须首先重新映射到生态技能方法上，然后才能扩展到新的规模。我的工作地点是拉马特（加拿大魁北克省），这里由 15 个海洋梯田组成，面积超过 500,000 m ²。缓慢的沉积过程和犁耕混合了其石器遗迹，形成了一个一万年范围的沉积单元，但时间和空间控制很差。 1995 年至 1999 年间进行的实地调查采样了其总表面的 0.03%。其 2111 个工具和 207,506 个薄片中的大部分都在其 40 厘米厚的犁区中被发现。我构建了方法论工具——分散面、技能组合和扩展的技能缩减序列——来描述拉马特基因座（16-west）之一的一小部分子集（ N = 93）。我描述了十个扩展的熟练还原序列，显示了不同程度的技巧和敲击方法。然后使用脚手架、引导参与和通过共享活动的连续性的概念来解释这些模式。