Bone may show growth marks, most commonly linesof arrested growth (LAGs), which record cessation ofbone apposition, albeit for an unknown duration.Othe rtypes of growth marks are modulations (Rimblot-Balyet al.199 5) and polish lines (Sander 2000).Making thewell-founded assumption of annual growth cyclicity(Castanet et al.1993 ; Chinsamy 1993), the growth markrecord can be quantified (this technique, called skeletochronology,is regularly used in the study of recentvertebrates), and estimates of growth and important lifehistoryparameters become possible (Ricql"es 1980;Castanet et al.1993 ; Castanet 1994).