diff --git a/src/enzo/ExternalBoundary_DeleteObsoleteFields.C b/src/enzo/ExternalBoundary_DeleteObsoleteFields.C
new file mode 100644
index 000000000..a9cb0907d
--- /dev/null
+++ b/src/enzo/ExternalBoundary_DeleteObsoleteFields.C
@@ -0,0 +1,70 @@
+/***********************************************************************
+/
+/  EXTERNAL BOUNDARY CLASS (DELETES OBSOLETE EXTERNAL BOUNDARY VALUES)
+/
+/  written by: John Wise
+/  date:       November, 2009
+/  modified1:
+/
+/  PURPOSE:
+/
+************************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include "ErrorExceptions.h"
+#include "macros_and_parameters.h"
+#include "typedefs.h"
+#include "global_data.h"
+#include "Fluxes.h"
+#include "GridList.h"
+#include "ExternalBoundary.h"
+#include "Grid.h"
+
+// This routine reads the external boundary from the provided file pointer
+//
+
+/* function prototypes */
+
+int ExternalBoundary::DeleteObsoleteFields(int *ObsoleteFields,
+					   int NumberOfObsoleteFields)
+{
+
+  int i, j, k, dim, field;
+  int NumberOfDeletions = 0;
+
+  for (field = 0; field < NumberOfObsoleteFields; field++)
+    for (i = 0; i < NumberOfBaryonFields; i++)
+      if (BoundaryFieldType[i] == ObsoleteFields[field]) {
+
+	/* Delete values and shift BoundaryFieldType and BoundaryType
+	   back */
+
+	for (j = i; j < MAX_NUMBER_OF_BARYON_FIELDS-1; j++)
+	  BoundaryFieldType[j] = BoundaryFieldType[j+1];
+	BoundaryFieldType[MAX_NUMBER_OF_BARYON_FIELDS-1] = FieldUndefined;
+
+	for (dim = 0; dim < BoundaryRank; dim++)
+	  if (BoundaryDimension[dim] > 1) {
+	    for (j = 0; j < 2; j++) {
+
+	      delete [] BoundaryType[i][dim][j];
+	      for (k = i; k < MAX_NUMBER_OF_BARYON_FIELDS-1; k++)
+		BoundaryType[k][dim][j] = BoundaryType[k+1][dim][j];
+	      BoundaryType[MAX_NUMBER_OF_BARYON_FIELDS-1][dim][j] = NULL;
+
+	    } // ENDFOR direction (face)
+	  } // ENDIF dimension > 1
+
+	NumberOfDeletions++;
+
+	break;
+
+      } // ENDIF matching field
+
+  NumberOfBaryonFields -= NumberOfDeletions;
+
+  return SUCCESS;
+
+}
diff --git a/src/enzo/Grid_DeleteObsoleteFields.C b/src/enzo/Grid_DeleteObsoleteFields.C
new file mode 100644
index 000000000..573b73b99
--- /dev/null
+++ b/src/enzo/Grid_DeleteObsoleteFields.C
@@ -0,0 +1,76 @@
+/***********************************************************************
+/
+/  GRID CLASS (DELETE OBSOLETE FIELDS WHEN RESTARTING)
+/
+/  written by: John Wise
+/  date:       November, 2009
+/  modified1:
+/
+/  PURPOSE:
+/
+************************************************************************/
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include "ErrorExceptions.h"
+#include "macros_and_parameters.h"
+#include "typedefs.h"
+#include "global_data.h"
+#include "Fluxes.h"
+#include "GridList.h"
+#include "ExternalBoundary.h"
+#include "Grid.h"
+#include "Hierarchy.h"
+#include "TopGridData.h"
+#include "LevelHierarchy.h"
+
+bool FirstTime = true;
+
+int grid::DeleteObsoleteFields(int *ObsoleteFields, 
+			       int NumberOfObsoleteFields)
+{
+
+  int i, j, field, NumberOfDeletions = 0;
+
+  for (field = 0; field < NumberOfObsoleteFields; field++)
+    for (i = 0; i < NumberOfBaryonFields; i++)
+      if (FieldType[i] == ObsoleteFields[field]) {
+
+	if (debug && FirstTime)
+	  printf("Deleting unused field %d (FieldType = %d = %s)\n", 
+		 i, ObsoleteFields[field], DataLabel[i]);
+
+	/* Delete field */
+
+	if (MyProcessorNumber == ProcessorNumber)
+	  delete [] BaryonField[i];
+
+	/* Shift FieldType and BaryonField back */
+
+	for (j = i; j < MAX_NUMBER_OF_BARYON_FIELDS-1; j++)
+	  FieldType[j] = FieldType[j+1];
+	FieldType[MAX_NUMBER_OF_BARYON_FIELDS-1] = FieldUndefined;
+
+	if (MyProcessorNumber == ProcessorNumber) {
+	  for (j = i; j < MAX_NUMBER_OF_BARYON_FIELDS-1; j++)
+	    BaryonField[j] = BaryonField[j+1];
+	  BaryonField[MAX_NUMBER_OF_BARYON_FIELDS-1] = NULL;
+	}
+
+	if (FirstTime) {
+	  for (j = i; j < MAX_NUMBER_OF_BARYON_FIELDS-1; j++)
+	    DataLabel[j] = DataLabel[j+1];
+	  DataLabel[MAX_NUMBER_OF_BARYON_FIELDS-1] = NULL;
+	}
+
+	NumberOfDeletions++;
+	break;
+
+      } // ENDIF matching field
+
+  NumberOfBaryonFields -= NumberOfDeletions;
+  FirstTime = false;
+
+  return SUCCESS;
+
+}