Index: src/webapp/extensions/time/scripts/timeline-view.js
===================================================================
--- src/webapp/extensions/time/scripts/timeline-view.js	(revision 1728)
+++ src/webapp/extensions/time/scripts/timeline-view.js	(working copy)
@@ -28,7 +28,7 @@
 };
 
 Exhibit.TimelineView._intervalChoices = [
-    "millisecond", "second", "minute", "hour", "day", "week", "month", "year", "decade", "century", "millennium"
+    "millisecond", "second", "minute", "hour", "day", "week", "month", "year", "decade", "quarter_century", "century", "millennium"
 ];
 
 Exhibit.TimelineView._settingSpecs = {
@@ -243,6 +243,7 @@
                     "month":            Timeline.DateTime.MONTH,
                     "year":             Timeline.DateTime.YEAR,
                     "decade":           Timeline.DateTime.DECADE,
+                    "quarter_century":  Timeline.DateTime.QUARTER_CENTURY,
                     "century":          Timeline.DateTime.CENTURY,
                     "millennium":       Timeline.DateTime.MILLENNIUM
                 };