Opinion by
Judge Craig,Hopewell Township, in York County, has appealed from the Court of Common Pleas of York County, which held certain agricultural zone provisions of the Hopewell Township Zoning Ordinance (Ordinance) to be unconstitutional.,..
*575In 1968, Edward B. G-olla and Elizabeth M. Golla, husband and wife, purchased a 140-acre farm in Hopewell Township. On December 29, 1976, they conveyed a ten percent interest in their farm, “undivided but divisible on demand”, to each of their three sons, with the understanding that the land would be permanently partitioned when a survey of the land was completed. They proposed to effect further conveyances of tracts of land of approximately ten acres or more to their sons and contemplated partitioning the 140-acre tract into seven, and possibly as many as fourteen parcels, each of which would contain ten or more acres.
However the township has stipulated that if the landowners attempted the contemplated partition, it would prosecute them under Section 203.21 of the Ordinance, limiting the residential subdivision of any tract in an agricultural zone to a “minor residential land development” of not more than five residential lots, together with Section 203.92 of that Ordinance, *576limiting the size of each such residential lot to not more than 1 1/2 acres, unless not suitable for agriculture.
After the Hopewell Township Zoning Hearing-Board (board) upheld the validity of those sections, the trial court found them to be invalid, by a three-to-two decision.
Judge Blakey, in his majority opinion, correctly introduced the issue by stating:
This case presents a classic confrontation between a basic property right of land owners, to convey their property to their children or others as they see fit, and a restriction of that right in what is declared to be in the public interest. . . .
*577Ever since Village of Euclid v. Ambler Realty Co.,.272 U.S. 365 (1926), it is clear that a restriction of private property rights by a zoning ordinance is proper when (a) the ordinance has a purpose that promotes the public health, safety or general welfare and (b) the means used to achieve that goal of the ordinance are substantially related to the end sought.
One challenging a zoning ordinance must bear the heavy burden of proving clearly and unmistakenly the unconstitutionality of the ordinance. Bilbar Construction Company v. Easttown Township Board of Adjustment, 393 Pa. 62, [141 A.2d 851] (1958); Benham v. Board of Supervisors of Middletown Township, 22 Pa. Commonwealth Ct. 245, [349 A.2d 484] (1975). To put it another way, a particular provision of a zoning ordinance must be clearly arbitrary and unreasonable and without substantial relation to public health, safety, or general welfare, before it can be declared unconstitutional.
We agree with the trial court and the board that the preservation of prime agricultural land is a sound, lawful and constitutional purpose of zoning regulations.3 However, the method chosen here, actually a regulation of the subdivision of land, runs afoul of *578current statutory and constitutional law. We agree with the trial court’s conclusions as to the subdivision limitations here because
—this regulation of subdivision flatly violates the enabling act; and
—allowing only five residential lots per tract, without regard to the size of tracts, produces irrational results unrelated to lawful land use control purposes.
1. Violation of Subdivision Enabling Statute
The basic statutory power of Pennsylvania municipalities to regulate the subdivision of land is limited by these words:
Provided, however, That the division of land for agricultural purposes into parcels of more than ten acres, not involving any new street or easement of access, shall be exempted.
That provision, within the definition of “Subdivision” in Section 107(21) of the Pennsylvania Municipalities Planning Code (MPC), Act of July 31, 1968, P.L. 805, as amended, 53 P.S. §10107(21), is a clear legislative exemption allowing what the landowners here call “farmettes,” as small as just over ten acres each.
The landowners, in their formal statement to the zoning hearing board and their notice of appeal, definitely proposed agricultural purposes for their ten-acre tracts, as required by Suburban Group, Inc. v. Gittings, 22 Pa. Commonwealth Ct. 295, 348 A.2d 490 (1975).
Moreover, a conflict between the Ordinance and the statute is manifested by the Ordinance provision which allows a residential lot (larger than 11/2 acres) only if not suitable for agriculture, while the statutory exemption applies only where the division is created for agricultural purposes.
Here, although the questioned regulation is contained in an ordinance captioned as a zoning ordi*579nance, the label of the ordinance cannot affect the case because this ordinance is clearly one which seeks to control the subdivision of tracts into lots, precisely the definition of subdivision which is embodied in the MPC section cited above. Note also subsections (c) and (d) of §203.9 of the Ordinance, quoted in footnote 2, which expressly apply to subdivision action as such.
Until the legislature amends the statutory expression of the public will, neither any municipal board nor this court, however laudable the aim, has any warrant to revise the legislative allowance of lot divisions of ten-acres-plus for agricultural purposes. Although earnest innovations in land use control approaches are commendable, this approach is ultra vires at present.
2. Irrational Results in Application
As stated above, we cannot disagree with the finding of the township board that the agricultural usage of land in the township is worthy of preservation.
However, one difficulty with Ordinance is highlighted by the board’s twenty-third finding:
(23) Productivity of farms and efficiency of farming operations would be decreased by the division of productive farms into ten (10), twenty (20) or less than fifty (50) acre tracts and in addition, interfere with conservation practices.
Thus the board found that an agricultural parcel division of fifty acres or more would not violate the preservation policy. In addition to conflicting with the legislature’s policy, as noted above, this finding casts much doubt upon the reasonableness of the Ordinance, which, in essence, provides that the minimum farm size in Hopewell Township shall be determined in relation to whatever size the particular agricultural tract happened to have when the agricultural zoning was adopted.
*580A land nse control which results in arbitrarily different conclusions, when applied to various properties, is invalid. White’s Appeal, 287 Pa. 259, 134 A. 409 (1926), which condemned the determination of setbacks according to the happenstance of existing setbacks nearby, retains its vitality as a precedent here.
Here a limitation of not more than five residential lots for any tract, without reference to the size of tract, obviously produces residential density results and minimum lot areas which vary greatly with each tract. As applied to the 140-acre tract of landowners here, the maximum density, by arithmetic, is twenty-eight acres per family4 and, after deduction of an allowable minor residential land development of 7% acres, the end result is a minimum agricultural lot size of 132% acres. In contrast, as applied to a 50-acre tract, for example, the density switches to one family per ten acres5 and, with a minor residential land development deducted, the minimum agricultural lot size there would become 42% acres (notably, less than the fifty acres considered by the board to be a desirable agricultural minimum).
Because such variant results lack rational relationship to the purpose of preserving prime agricultural land and constitute disparate burdens upon different landowners, depending upon the happenstance of the respective tract’s configuration when the zoning was adopted, we must conclude that the Ordinance is invalid and unconstitutional with respect to the regulation of subdivision effected by the ‘‘minor resi*581dential land development” provisions constituting all of'Section 203.9 and part of subsection 203.2(1).
The trial court order, wbicb bolds subsection 203.-2(1) void without qualification, if taken literally, would delete one-family dwellings entirely from the permitted uses of the agricultural zone, even as to farms, because the separate permitted use listing in subsection (5), “Farm buildings and all agricultural uses,” speaks to agricultural buildings only, leaving subsection (1) as the basic authorization for dwellings, whether on farms or lots. Accepting the township’s view that the ordinance provisions should be viewed as severable,6 our affirmance will modify the order below to make clear that the law condemns only the subdivision restrictions, not the allowance of one-family dwellings.
3. Legislative Restrictions on Judicial Relief
The township here has also contended that no invalidation of ordinance provisions by the trial court should be upheld because that court has not made the specific determinations required by Section 1011(1) *582of the MPC, 53 P.S. §11011(1), the pertinent part of which provides:
Section 1011. Judicial Belief.- — ■
(1) In a zoning appeal the court shall have power to declare any ordinance or map invalid and set aside or modify any action, decision or order of the governing body, agency or officer of the municipality brought up on appeal, only if it determines that:
(a) the municipality has not acted in good faith or made a bona fide attempt in the adoption of its ordinances or maps, or any' amendments thereto, to meet the statutory and constitutional requirements for nonexclusionary' zoning; or
(b) the ordinance imposes limitations that are not reasonably related to the municipality’s authority to determine its physical growth pattern, protect the Commonwealth’s public natural resources, coordinate development with the provision of public services, or protect the character of the community.
Upon reargument, we requested that counsel direct their attention to the validity of that subsection, our concern centering upon its status with reference to the constitutional separation between legislative and judicial power.
Clause (a) of the subsection is apparently applicable where an ordinance has fallen short of meeting the law’s requirement that zoning be nonexclusionary; taken together with the leading clause (1), it flatly provides that a court has power to declare such a zoning ordinance provision invalid only if a muncipality’s action or attempt has not been in good faith. If we take this clause (a), .standing alone as it is, literally to mean that exclusionary zoning achieved in *583innocence is nevertheless constitutional, the legal infirmity of the clause is obvious.
Therefore we move on to consider the disjunctively-related clause (b), which (also read with the leading clause) purports to permit judicial invalidation of a zoning ordinance provision only if there is a determination that the restrictions are not'“reasonably related” to the municipality’s authority as to (1) physical growth pattern determination, (2) public natural resources protection, (3) development and public services coordination, or (4) community character protection. Of course, it is possible that zoning which is exclusionary or discriminatory or violative of substantive due process may, by reason of such an infirmity, be also condemnable as an unreasonable means of determining growth, coordinating development or protecting resources or community character.
On the other hand, this statutory description of the scope of judicial review, by its very terms, circumscribes the courts more narrowly than the fundamental rule that the courts must overturn zoning provisions which are not reasonably related to the promotion and protection of the public health, safety, morals or general welfare, or which otherwise violate constitutional provisions or enabling act limitations. Gladwyne Colony, Inc. v. Lower Merion Township, 409 Pa. 441, 446-47, 187 A.2d 549, 551-52 (1963); Grafton v. Conte, 364 Pa. 578, 584, 73 A.2d 381, 385 (1950); Kerr’s Appeal, 294 Pa. 246, 144 A. 81 (1928); Ward’s Appeal, 289 Pa. 458,137 A. 630 (1927).
Even more significantly, the purportedly exclusive grounds for invalidation of zoning allowed the courts by subsection 1011(1) fall short of covering other considerations essential to the validity of zoning ordinance provisions per se. We may well conclude that the subsection’s express concern with the declaration of invalidity of an ordinance or map means that it *584does not seek to reach the “validity variance” function, where the challenge is not to the ordinance provision itself, but only to its confiscatory effect when applied to a particular property. See Ferry v. Kownacki, 396 Pa. 293, 152 A.2d 456 (1959). However, as to judicial review of zoning ordinance provisions as such, clause (b) of the subsection would inhibit judicial duty as to a number of validity grounds. If we examine just one of the categories of general validity claims usefully developed in R. Ryan, Pennsylvania Zoning Law and Practice, Ch. 3, we see that the subsection would fence the courts away from “planning methods” issues, as where the questioned provision was enacted by an unauthorized process, Kline v. Harrisburg, 362 Pa. 438, 68 A.2d 182 (1949), or without the adoption of a formal statement of community objectives, see MPC §606, 53 P.S. §10606, or where a land use control function has been granted to the wrong local agency, Eves v. Zoning Board of Adjustment, 401 Pa. 211, 220-21, 164 A.2d 7, 12 (1960), or where a specific classification is automatically applied to land newly annexed to the municipality, Cameron v. Greensburg, 3 Pa. Commonwealth Ct. 209, 281 A.2d 271 (1971); in all of such cases, the substantive content of the requirement could be “reasonably” related to the municipality’s authority to determine, coordinate and protect its development, but the ordinance provisions, however reasonable, would not represent a lawful exercise of that authority.
In summary, clause (b), if broadly interpreted, may allow the courts to deal with substantive due process issues (including exclusion, see Surrick v. Zoning Hearing Board of Upper Providence Township, 476 Pa. 182, 382 A.2d 105 (1977)), with substantive power to zone (“authority” to determine growth, etc.), and even with discriminatory regulations such as spot zoning (if we assume that spot or discriminatory zon*585mg can never be “reasonably related”), but only if the court can make at least one of the determinations specified by the legislature in terms different from — if not narrower than — .the terms of judicial' constitutional doctrine.
Although subsection 1011(1), with its clause (b), perhaps cannot be faulted for what it purports to allow courts to do in the way of judicial review of municipal legislation, the key word “only” would limit courts to no more than that. Clearly, the legislature cannot inhibit judicial review of legislation, recognized as an unassailable judicial duty and power since Marbury v. Madison, 5 U.S. (1 Cranch) 137 (1803). In Leahey v. Farrell, 362 Pa. 52, 56, 66 A.2d 577, 579 (1949) the Pennsylvania Supreme Court reiterated:
'No less clear is if, under the constitutional distribution of governmental powers, that the legislature cannot dictate to the courts how they shall decide matters coming before them judicially.’ (Emphasis supplied by the Supreme Court in Leahey, supra.)
Therefore, we conclude that subsection 1011(1), as to the portion here under consideration, is an unconstitutional transgression of the separation of powers.
We note that subsection (2) of Section 1011 of the MPC follows subsection (1) by providing that a court, after invalidating an ordinance provision, in granting relief with or without qualification, “shall consider” various other planning factors;7 however, the town*586ship here has explicitly declined to urge consideration of that subsection, contending instead that it is not applicable to this case in view of the severability of the ordinance provisions involved. Accordingly, we will not deal with issues not raised.8
The order of the common pleas court will be affirmed, modified for clarification as stated above.
Order
Now, April 21,1981,' the order of the Court of Common Pleas of York County dated November 30, 1979 is modified to hold that Section 203.9 of the Hopewell Township Zoning Ordinance is unconstitutional and void and that subsection 203.2(1) thereof is unconstitutional and void except as it authorizes a one-family dwelling as a permitted use in the zoning district, but nothing herein shall exempt the subdivision here proposed .by appellants, as it may be encompassed in a subdivision application, from compliance with other provisions of the Hopewell Township Zoning Ordinance and those of any other applicable laws, including subdivision regulations, if any; as thus modified, that order is affirmed.
*587This decision was reached before the expiration of the term of office of Judge Wilkinson, Jr.
Section 203.2 reads, in pertinent part:
§203.2 Uses Permitted: No building or structure may . be erected or used and no land may be used or occupied except for the following principal uses:
1. One-family dwelling on an approved lot in a minor residential land development or on an individual lot the dimensions of which have not changed since June 5, 1974.
“Minor residential land development” is defined in Section 102.2 of the Ordinance as “a residential land development consisting of five or fewer existing or proposed dwelling units.”
Section 203.9 reads:
§203.9 Regulations Involving Lots in a Minor Residential Land Development:
a) Lots to be separated from the original tract shall not contain more than one and one-half (1 1/2) acres for each dwelling unit assigned to the tract being separated unless it is determined that the lot is not suitable for agricultural use.
b) Lots shall be considered unsuitable for agricultural use if:
*5761) The lot is on land in soil capability 'Units IV e-5 through VII s-2 as classified by the Soil Survey of York County, Pennsylvania, Series 1959, No. 23 issued May, 1963; or
2) The lot is on lands which cannot feasibly be farmed;
a) Due to the existing features of the site such as rock outcroppings, rock too close to the surface to permit plowing, swamps, the fact that the area is heavily wooded, or the fact that the slope of the area exceeds fifteen (15%) percent; or
b) Due to the fact that the size or shape of the area suitable for farming is insufficient to permit efficient use of farm machinery.
c) The applicant shall have the burden of proving that the land which he seeks to subdivide into lots larger than one and one-half (1 1/2) acres meets the criteria set forth in subsection ‘b’ hereof.
d) A property owner submitting a subdivision plan for a minor residential development will be required to specify on his plan which lot or lots carry with them the right to erect or place any unused quota of dwelling units his tract may have.
e) Nothing contained in this section shall be interpreted to prevent a bona fide ‘farm’ from adding adjacent ground to that farm.
Enacted after the Ordinance in question here, Section 604(3) of the Pennsylvania Municipalities Planning Code (MPC), Act of July 31, 1968, P.L. 805, as amended, added by Section 1 of the Act of November 26, 1978, P.L. 1209, 53 P.S. §10604(3) now provides that the provisions of zoning ordinances may be designed “[t]o preserve prime agriculture and farmland considering topography, soil type and classification, and present use.” We view the general zoning purposes of Section 604(1) and (2) of the MPC, 53 P.S. §10604(1), (2) as having theretofore provided like authority with respect to the preservation of agricultural land.
This results from dividing 140 acres by 5 dwelling units. If tbe ordinance is read as allowing a sixth dwelling, on the agricultural parcel, the density would be 23.3 acres per family.
If, as suggested by note 4, supra, the ordinance allows six dwellings per original parcel (5 in a minor residential subdivision and one on a residual agricultural lot), this density would be 8.3 acres per family. In either case, arbitrary densities result.
The township, stopping short of logical acceptance of its own view as to severability, contends that, in invalidating the subdivision restrictions contrary to this case, we must also invalidate Ordinance subsection 203.2(1) as it permits one-family dwellings in the agricultural zone. Because the authorization of one-family dwellings has not been attacked and therefore has not been shown to be unlawful for any reason, the subdivision must be deemed severable to that extent; otherwise, as indicated in the text, and because there is no authorization for any other kind of dwelling, total invalidation of subsection 203.2(1) would result in an agricultural zone -which, aside from pre-existing dwellings, would be an uninhabited district.
The township’s contention, contrary to the principles of sever-ability, would not save the agricultural zone but would subject it to a new illegality, a freeze against any future habitation within it. We cannot help but note that the township’s contention thus would serve chiefly to block the landowner’s proposal in this case.
Subsection (2), 53 P.S. §11011(2), in summary, requires that, in fashioning relief, a court must consider suitability of the site in relation to community facilities and any comprehensive plan which may exist, impact on regional housing and transportation, suitability of site in relation to its natural features, any Impact of the use upon the site’s natural features, and the impact of the proposal on the preservation of agriculture and other essential land uses.
In this respect, the record refutes the township’s claim that the subdivision enabling law (MPC §107(21)) issue was not raised by landowners below. See the Notice of Appeal below, par. 12c, which, raised that issue very specifically, by stating that one of the challenges filed with the Board was that “The ordinances attempt to regulate subdivisions which are excluded from township regulation by Article I, Section 107 (21) of the Pennsylvania Municipalities Planning Code. . . .”
■ The same Notice of Appeal preserved that statutory limitation issue before the court below by concluding with a prayer for relief which expressly prayed the court to determine that
The challenged ordinance sections 203.2 and 203.9 are exclusionary zoning, confiscatory, vague, unreasonable, arbitrary, capricious and exceed the statutory limitations of the Pennsylvania Municipalities Planning Code. (Emphasis supplied.)