mat">
    <h2>Format</h2>
    <p>A data frame/tibble  with 60 observations on two variables</p><dl><dt>age</dt>
<dd><p>number of years before 1983 - the year the data were obtained</p></dd>

<dt>phase</dt>
<dd><p>Ceramic Phase numbers</p></dd>
 

</dl></div>
    <div id="source">
    <h2>Source</h2>
    <p>Cunliffe, B. (1984) and Naylor and Smith (1988).</p>
    </div>
    <div id="references">
    <h2>References</h2>
    <p>Kitchens, L. J. (2003) <em>Basic Statistics and Data Analysis</em>.
Pacific Grove, 